178 pubblicazioni classificate nel seguente modo:

3-Aryl-2H-benzo[1,4]oxazin-4-oxides: a mew class of spin traps
Autore/i: Astolfi, Paola; M., Marini; Stipa, Pierluigi
Classificazione: 5 Altro
Abstract: Comunicazione Scientifica al GIRSE-ARPE 1st Joint Meeting, Vietri sul Mare (Italy)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/58251

Radical Cations from Dipyridinium derivatives: a combined EPR and DFT Study
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Autore/i: Stipa, Pierluigi
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32443

A Multi-Step procedure for evaluating the EPR parameters of Indolinonic Aromatic Aminoxyls: a combined DFT and spectroscopic study
CHEMICAL PHYSICS
Autore/i: Stipa, Pierluigi
Classificazione: 1 Contributo su Rivista
Abstract: A DFT study on indolinonic aromatic aminoxyls has been carried out at different levels of theory. The comparison with previous experimental data from ENDOR, X-rays and PND (polarized neutron diffraction) techniques confirms that such a computational approach represents an important aid for understanding the properties of this class of aminoxyls such as hyperfine coupling constants (hfcc), isotropic g-factors, spin density distributions and geometries. At first, a model compound was studied with different model chemistries; B1LYP, B3LYP and PBE0 hybrid functionals were employed in conjunction with various medium to large size basis sets. The study outlines that none of the model chemistries considered is able to correctly describe the EPR features of these radicals by itself. For this reason, by taking into account a compromise between accuracy and computational cost, a multi-step procedure was checked over a homogeneous series of indolinonic aminoxyls and then proposed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32155

Hydroxyl Radical Trapping by Benzoxazine Nitrones
Autore/i: M., Marini; Stipa, Pierluigi
Classificazione: 5 Altro
Abstract: Comunicazione Scientifica al 6th Meeting of the European Federation of EPR Groups, Madrid (Spain), 2006
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/58253

Diarilnitrossidi da Nitrosobenzeni con Monossido e Biossido di Azoto
7° Convegno Nazionale GIRSE
Autore/i: Lucedio, Greci; Stipa, Pierluigi; Astolfi, Paola; Maria, Panagiotaki; Milvia, Marini
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/83364

Process for the controlled radical polymerization or copolymerization of ethylene under high pressure in the presence of initiating free radicals and of controlling indoline nitroxide radicals
Autore/i: E., Minaux; L., Greci; M., Buback; P., Tordo; T., Senninger; Stipa, Pierluigi; Carloni, Patricia; Damiani, Elisabetta; G., Tommasi
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48656

Oxazoles Formation During O-Alkylation of Isonitroso-naphthols. X-Ray Structure of [1,2]Naphthoquinone 1-[O-(4-tert-Butyl-benzyl)-oxime] and 2-(4-tert-Butyl-phenyl)Napth[1,2-d]Oxazole
JOURNAL OF HETEROCYCLIC CHEMISTRY
Autore/i: Astolfi, Paola; Carloni, Patricia; Castagna, R; Greci, Lucedio; Rizzoli, C; Stipa, Pierluigi
Classificazione: 1 Contributo su Rivista
Abstract: 1-Nitroso-2-naphthol and 2-nitroso-1-naphthol, both in the isonitroso form, react with benzyl bromides in THF and in the presence of triethylamine affording, in low yields, the corresponding O-benzyl oximes and 2-aryl naphthoxazoles in a 1:1 ratio, approximately. The structures of O-benzyl oximes and naphthoxazoles isolated have been determined by X-ray analysis.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51020

Regio- and Diasteroselectivity in 1,3-dipolar cycloaddition reactions of 2-phenylisatogen and its 3-phenylimino derivative with electron deficient alkenes. Part 2.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Autore/i: Astolfi, Paola; Bruni, Paolo; Greci, Lucedio; Stipa, Pierluigi; Righi, L.; Rizzoli, C.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52386

Nitrenium ions. Reactions of N,N-dimethyl-p-benzoyloxyaniline-iminium chloride with indoles and indolizines. X-ray structure of unexpected [2-chloro-4-(4-dimethylaminophenyl-ONN-azoxy)-phenyl]dimethylamine (azoxy derivative)
ORGANIC & BIOMOLECULAR CHEMISTRY
Autore/i: Greci, L.; Castagna, R.; Carloni, Patricia; Stipa, Pierluigi; Rizzoli, C.; Righi, L.; Sgarabotto, P.
Editore: Royal Society of Chemistry:Thomas Graham House, Science Park, Cambridge CB4 0WF United Kingdom:011 44 1223 432360, EMAIL: sales@rsc.org, INTERNET: http://www.rsc.org, http://www.chensoc.org, Fax: 011 44 1223 423429
Classificazione: 1 Contributo su Rivista
Abstract: N,N-Dimethyl-p-nitrosoaniline reacts with benzoyl chloride affording a complex salt containing a cation, a hybrid between a nitrenium ion and an iminium ion. The salt reacts with nucleophiles (indoles, indolizines) yielding compounds characterized by a new carbon-nitrogen bond, derived from the nitrenium ion form. According to the type of nucleophile, the reaction, to differing extents, is in competition with an electron transfer process which leads to the formation of the dimer of the nucleophile and of the azoxy corresponding to the N,N-dimethyl-p-nitrosoaniline. In one of the reactions studied, a chlorinated azoxy derivative was also isolated, and its structure was elucidated by X-ray analysis.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31655

Process for the controlled radical polymerization or copolymerization of ethylene under high pressure in the presence of initiating free radicals and of controlling indoline nitroxide radicals
Autore/i: E., Minaux; L., Greci; M., Bubak; P., Tordo; T., Senninger; Stipa, Pierluigi; Carloni, Patricia; Damiani, Elisabetta; G., Tommasi
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48797

Reactivity of Ubiquinones and Ubiquinols toward Free Radicals
FREE RADICAL RESEARCH
Autore/i: Giorgini, Elisabetta; G., Tommasi; Stipa, Pierluigi; G., Tosi; G., Littarru; L., Greci
Editore: Harwood Academic Publishers:PO Box 90, Reading RG1 8JL United Kingdom:011 44 118 9560080, 011 44 118 9520303, EMAIL: philip.bott@gbmis.gbhap.com, INTERNET: http://www.edoc.com, Fax: 011 44 118 9568211
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/33141

Reactivity of Ubiquinones and Ubiquinols with Free Radicals
FREE RADICAL RESEARCH
Autore/i: Giorgini, Elisabetta; Tommasi, G; Stipa, Pierluigi; Tosi, G; Littarru, GIAN PAOLO; Greci, L.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50980

Procede de Polimerisation ou Copolimerisation Radicalaire Controlee de l’Ethylene sous Haute Pression en presence de Radicaux Libres Amorceurs et de Radicaux Nitroxydes Indoliniques Controleurs
Autore/i: E., Minaux; L., Greci; M., Bubak; P., Tordo; T., Senninger; Stipa, Pierluigi; Carloni, Patricia; Damiani, Elisabetta; G., Tommasi
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48794

The reactivity of aminoxyls towards peroxyl radicals: an ab initio thermochemical study
JOURNAL OF THE CHEMICAL SOCIETY. PERKIN TRANSACTIONS 2
Autore/i: Stipa, Pierluigi
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50386

Reactivity of 2,2-diphenyl-1,2-dihydro-4-ethoxy-quinoline-1-oxyl towards oxygen- and carbon-centered radicals.
PERKIN 2
Autore/i: Carloni, Patricia; Damiani, Elisabetta; Scattolini, M.; Stipa, Pierluigi; Greci, L.
Classificazione: 1 Contributo su Rivista
Abstract: 2,2-Diphenyl-1,2-dihydro-4-ethoxyquinolin-1-yloxyl reacts efficiently with both carbon and oxygen centered (peroxyl, alkoxyl, hydroxyl) radicals leading to products which arise mainly from coupling of radicals with the N-Ȯ function or with the conjugated benzene ring. The reaction with superoxide radical is, however, not very effective, as predicted on the basis of the low reactivity of this radical in typical radical reactions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53384

Reactions between 1-Methyl-2phenyl-3-nitrosoindole, Activated with Benzoyl Chloride, with Indole and Indolizine derivatives as Nucleophiles: a Case of 1,3-Migration
JOURNAL OF CHEMICAL RESEARCH. SYNOPSES
Autore/i: M., Rossetti; Stipa, Pierluigi; R., Petrucci; L., Greci
Editore: -London: Chemical Society. -Middlesex United Kingdom: Scientific Reviews Limited
Classificazione: 1 Contributo su Rivista
Abstract: JOURNAL OF CHEMICAL RESEARCH. MINIPRINT] - issn: 0308-2350 1999, 1634.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32747

Reactivity of an Indolinonic Aminoxyl with Superoxide Anion and Hydroxyl Radicals
FREE RADICAL RESEARCH
Autore/i: Damiani, Elisabetta; Carloni, Patricia; Stipa, Pierluigi; L., Greci
Editore: Harwood Academic Publishers:PO Box 90, Reading RG1 8JL United Kingdom:011 44 118 9560080, 011 44 118 9520303, EMAIL: philip.bott@gbmis.gbhap.com, INTERNET: http://www.edoc.com, Fax: 011 44 118 9568211
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: The increasing knowledge on the participation of free radicals in many diverse clinical and pathological conditions, has consequently expanded the search for new and versatile antioxidants aimed at combating oxidative stress. Our interest in this field concerns aromatic indolinonic aminoxyls (nitroxides) which efficiently react with alkoxyl, peroxyl, aminyl, arylthiyl and alkyl radicals to give non-paramagnetic species. This prompted us to test their antioxidant activity on different biological systems exposed to free radical-induced oxidative stress and the results obtained so far have been very promising. However little is known about their behaviour towards superoxide and hydroxyl radicals. Here, we report on the reactivity of an indolinonic aminoxyl, with the two above mentioned radicals using hypoxanthine/xanthine oxidase and potassium superoxide for generating the former and the Fenton reagent for the latter. Besides performing the deoxyribose assay for studying the reaction of the aminoxyl with hydroxyl radical and monitoring spectral changes of the aminoxyl in the presence of superoxide radical, macroscale reactions were performed in both cases and the products of the reactions isolated and identified. The EPR technique was used in this study to help elucidate the data obtained. The results show that this compound efficiently reacts with both hydroxyl and superoxide radicals and furthermore, it is capable of maintaining iron ions in its oxidized form. The results thus contribute to increasing the knowledge on the reactivity of indolinonic aminoxyls towards free radical species and as a consequence, these compounds and/or other aminoxyl derivatives, may be considered as complementary, and sometimes alternative sources for combating oxidative damage.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32441

Reactivity of sulphur-centered radicals with indolinonic and quinolinic aminoxyls.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Autore/i: Damiani, Elisabetta; Carloni, Patricia; M., Iacussi; Stipa, Pierluigi; Greci, Lucedio
Classificazione: 1 Contributo su Rivista
Abstract: Indolinonic, phenylimino-indolinonic and quinolinic aromatic aminoxyls readily react with sulfur-centered radicals, generated upon reaction with p- methylthiophenol at room temperature The main product is the deoxygenated derivative i.e the corresponding amine. The other compounds, obtained in low yields, are N-substituted amines and amines substituted in a conjugated position with respect to the amino group by arylthiyl, arylsulphinyl, arylsulphonyl and arylsulphonyloxy radicals. The formation of the products are explained by the initial attack of the thiophenol radical onto the NO· function to give an unstable adduct which decomposes to aminyl and arylsulphinyl radicals. From here the reaction can take two different routes to give the products obtained.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51462

Reactions of 1,2-dihydro-2-methyl-2-phenyl-3H-indole-3-one with different halogenating reagents.
ACTA CHEMICA SCANDINAVICA
Autore/i: Carloni, Patricia; Damiani, Elisabetta; L., Greci; Stipa, Pierluigi
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52003

Nitrenium ions. Part 4.1 Reactivity and crystal structure of 1-methyl-2-phenyl-3-N-benzoyloxyindole iminium perchlorate and reactivity of N,N-dimethylamino-p-N-benzoyloxyaniline nitrenium chloride with 2-phenylindole
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Greci, L.; Rossetti, M.; Galeazzi, Roberta; Stipa, Pierluigi; Sgarabotto, P.; Cozzini, P.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80664

On the reaction of aminoxyls with dioxiranes.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Autore/i: A., Dinoi; R., Curci; Carloni, Patricia; Damiani, Elisabetta; Stipa, Pierluigi; L., Greci
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: In the reactions of dimethyldioxirane (la) and methyl(trifluoromethyl)dioxirane (Ib) with 2,2,6,6-tetramethylpiperidinyl-1-oxyl (2) (TEMPO) in acetone, the corresponding methoxyamine 1-methoxy-2,2,6,6-tetramethylpiperidine (5) is produced in greater than or equal to 98% yield, both in air and under N-2, and in the absence or presence of a hydrocarbon (adamantane). Kinetic experiments show that aminoxyl 2 triggers the radical decomposition of the dioxirane, in addition to scavenging methyl radicals derived therefrom. The reactions of an aminoxyl less prone to oxidation, namely 1,2-dihydro-2-methyl-2-phenyl-3H-indol-3-one-1-oxyl (4), with dioxiranes la and Ib in acetone have also been studied. In these cases, not only is the corresponding methoxyamine 8a produced (yield 12-16%), but quinoneimine-N-oxides 10 (yield 12-21%) and 11 (yield 18-19%) are also formed. Furthermore, significant amounts (8-14%) of the amine 9 (the product of deoxygenation of 4) can be isolated. These observations provide useful information concerning the free-radical mechanism that follows the initial attack by the aminoxyl at the dioxirane.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51997

Nitrenium Ions Part 4. Reactivity and Chrystal Structure of 1-methyl-2-phenyl-3-N-benzoyloxyindole Iminium Perchlorate and Reactivity of N,N-dimethylamino-p-N-benzoyloxyaniline Nitrenium Chloride with 2-phenylindole
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Greci, L.; M., Rossetti; R., Galeazzi; Stipa, Pierluigi; P., Sgarabotto; P., Cozzini
Editore: Royal Society of Chemistry:Thomas Graham House, Science Park, Cambridge CB4 0WF United Kingdom:011 44 1223 432360, EMAIL: sales@rsc.org, INTERNET: http://www.rsc.org, http://www.chensoc.org, Fax: 011 44 1223 423429
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31658

Synthesis and Thermal Stability of Alkoxyamines
POLYMER DEGRADATION AND STABILITY
Autore/i: Stipa, Pierluigi; L., Greci; Carloni, Patricia; Damiani, Elisabetta
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52254

New insights into N-tert-Butyl-α-phenylnitrone (PBN) as a Spin Trap. Part 2. The Reactivity of PBN and 5,5-dimethyl-4,5-dihydropyrrole-N-oxide (DMPO) toward N-heteroaromatic bases
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Alberti, A.; Carloni, Patricia; Eberson, L.; Greci, L.; Stipa, Pierluigi
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50205

Indolinic and Quinolinic Aminoxyls as Biological Antioxidants
Free Radicals in Biology and Environment
Autore/i: Greci, L; Damiani, Elisabetta; Carloni, Patricia; Stipa, Pierluigi
Editore: Kluver Academic Publishers
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42775

Biological application of Aminoxyls
POLISH JOURNAL OF ENVIRONMENTAL STUDIES
Autore/i: Carloni, Patricia; Damiani, Elisabetta; L., Greci; Stipa, Pierluigi
Editore: "Hard"
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31659

Acid Catalyzed Rearrangments on Indole Systems. Wagner-Meerwein type transpositions
Topics in Heterocyclic Systems - Synthesis, Reactions and Properties
Autore/i: L., Greci; Carloni, Patricia; Stipa, Pierluigi
Editore: Research Signpost
Luogo di pubblicazione: Trivandum (INDIA)
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50657

Nitrogen Configuration Determined By X-Ray Analysis on an Homogeneous Series of 3-Indolinones
JOURNAL OF HETEROCYCLIC CHEMISTRY
Autore/i: Carloni, Patricia; L., Greci; Stipa, Pierluigi; D., Cauzzi; C., Rizzoli; P., Sgarabotto
Editore: Hetero Corporation:PO Box 170:Provo, UT 84603:(801)400-7373, EMAIL: jhetchem@yahoo.com, Fax: (801)356-7373
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31721

Nitrenium Ions Part 2. Acid-catalyzed Reactions of Indole with Nitrosobenzenes. Crystal Structure of 2-(indol-3-yl)-3-phenylimino-3H-indole
JOURNAL OF CHEMICAL RESEARCH. SYNOPSES
Autore/i: Carloni, Patricia; Greci, L; Iacussi, M; Rossetti, M; Stipa, Pierluigi; Rizzoli, C; Sgarabotto, P.
Editore: Royal Society of Chemistry:Thomas Graham House, Science Park, Cambridge CB4 0WF United Kingdom:011 44 1223 432360, EMAIL: sales@rsc.org, INTERNET: http://www.rsc.org, http://www.chensoc.org, Fax: 011 44 1223 423429
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: The reactions of indole with nitrosobenzenes in the presence of monochloroacetic acid have been studied demonstrating the existence of nitrenium ions; the structure of 2-(indol-3-yl)-3-phenylimino-H-3-indole has been determined by X-ray crystallography. JOURNAL OF CHEMICAL RESEARCH, Miniprint (M), 1924-1945.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31660

Chemical and electrochemical study on the interactions of aminoxyls with superoxide anion.
TETRAHEDRON
Autore/i: Carloni, Patricia; Damiani, Elisabetta; L., Greci; Stipa, Pierluigi; G., Marrosu; R., Petrucci; A., Trazza
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51835

Competition between Nucleophylic Addition and Electron-Transfer Process in the Reaction of 9-Diazo-10-Anthrone with Grignard Reagents
TETRAHEDRON
Autore/i: Bruni, Paolo; Carloni, Patricia; Conti, C; Giorgini, Elisabetta; Greci, L; Iacussi, M; Stipa, Pierluigi; Tosi, G.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51075

NEW INSIGHTS ON N-tert-BUTYL-α-PHENYLNITRONE (PBN) AS A SPIN TRAP. PART 1. REACTION BETWEEN PBN AND N-CHLOROBENZOTRIAZOLE.
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Carloni, Patricia; L., Eberson; L., Greci; P., Sgarabotto; Stipa, Pierluigi
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50873

Competition between nucleophilic addition and electron-transfer process in the reaction of 9-diazo-10-antrone with Grignard reagents
TETRAHEDRON
Autore/i: P., Bruni; Carloni, Patricia; Conti, Carla; Giorgini, Elisabetta; L., Greci; M., Iacussi; Stipa, Pierluigi; Tosi, Giorgio
Classificazione: 1 Contributo su Rivista
Abstract: 9-diazo-10-anthrone reacts with RMgX (R = Me, Et, Bu n, 5-hexenyl, Pr/, benzyl, Bu t) essentially yielding 9-alkylazo-10-hydroxy derivatives, which are isolated in their tautomeric quinoid structure as alkylhydrazones of 9,10-anthraquinone. The yields of these compounds decrease as the oxidation potentials (Eox) of the Grignards decrease: at the same time additional compounds, formed through a radical mechanism, are obtained in higher yields. The reaction has been interpreted as a competition between single electron transfer (SET) and nucleophilic attack, which occur with ratios varying with the oxidation potentials of the Grignard reagents. Evidences for the SET pathway have been found performing an experiment in the presence of 2,2.6,6- tetramethylpiperidine-l-oxyl (TEMPO) as a scavenger of C-centered radicals.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/79949

The Role of Aminoxyls in Polymer Stabilization
Proceedings of the 17th Annual International Conference on Advances in the Stabilization and Degradation of Polymers
Autore/i: L., Greci; A., Mar'In; Stipa, Pierluigi; Carloni, Patricia; Damiani, Elisabetta; A., Faucitano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/45306

On The Mechanism of the Reaction of Nitrosobenzenes with Benzenethiol: the Intermediacy of Aminoxyls and their deoxygenation
GAZZETTA CHIMICA ITALIANA
Autore/i: A., Alberti; M., Benaglia; Carloni, Patricia; L., Greci; Stipa, Pierluigi; C., Rizzoli; P., Sgarabotto
Editore: Bardi editore Societa Chimica Italiana:Viale Liegi 48, 00198 Rome Italy:011 39 06 8549691, EMAIL: soc.chim.it@agora.stm.it, Fax: 011 39 06 8548734
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: The reaction of benzenethiol with several substituted nitrosobenzenes carried out inside the cavity of an EPR spectrometer evidences the formation of adducts through the detection of the corresponding thionitroxides. The macroscale reaction of benzenethiol with nitrosobenzene confirmed the formation of the adduct and clarified the nature of the intermediates. The formation of azoxybenzene, aniline and nitrobenzene shows that an electron-transfer process between nitrosobenzene and benzenethiol is in competition with nucleophilic addition of the latter to the former compound. The identification of S-phenylbenzenethiosulphinate as well as the isolation of compound 9, bearing a sulphinyl group on a benzene ring, implies the formation of a sulphinyl radical, which is considered to be responsible for the formation of the sulphinylamide. The formation of the sulphenamide, the main reaction product, is attributed to the interaction of thiyl radicals with the intermediate thionitroxides. The crystal structure of S-methyl-S-phenyl-N-(o-sulphonylphenyl)benzenesulphilimine the unexpected product of the methylation of compound 9, is also described.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31722

Chemical and Electrochemical Reduction of the Products from the Reactions of Isoindolines and Tetracyanoethylene
TETRAHEDRON
Autore/i: Carloni, Patricia; L., Greci; Stipa, Pierluigi; D., Döpp; A. E. D. A. H., Hassan; A., Alberti
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52249

Aromatic Secondary Amines as Antioxidants for Polyolefins. Part 2: Phenothiazines
POLYMER DEGRADATION AND STABILITY
Autore/i: Greci, L; Marin, A; Stipa, Pierluigi; Carloni, Patricia
Editore: Elsevier Applied Science:An Imprint of Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington Oxford OX5 1GB United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: nlinfo-f@elsevier.nl OR usinfo-f@elsevier.com OR forinfo-kyf04035@niftyserve.or.jp, INTERNET: http://www.elsevier.nl/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: The thermoxidation of polypropylene (PP) at 200 degrees C in the presence of phenothiazine (1) and 3,7-di-tert-butylphenothiazine (2) was studied by measuring the oxygen consumption. The rate of oxygen consumption during the induction period passes through a minimum when the antioxidant concentration increases. Both compounds studied have the same critical concentrations but at high concentrations 2 is more efficient than 1. The results obtained may be explained by the differences in the evaporation rate of 1 and 2 during oxidation. ESR signals of radicals originating from 1 and 2 after polymer oxidation at 160 degrees C were observed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32450

Unexpected deoxygenation of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) by thiyl radicals through the formation of arylsuphinyl radicals
TETRAHEDRON
Autore/i: Carloni, Patricia; Damiani, Elisabetta; M., Iacussi; L., Greci; Stipa, Pierluigi; D., Cauzi; C., Rizzoli; P., Sgarabotto
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52251

N-NITOSODIPHENYLAMINE AS AN ALTERNATIVE NITROSATIN AGENT FOR INDOLES
SYNTHETIC COMMUNICATIONS
Autore/i: Cardellini, Liberato; L., Greci; Stipa, Pierluigi
Editore: Marcel Dekker Incorporated:270 Madison Avenue:New York, NY 10016:(800)228-1160, (212)696-9000, EMAIL: bookorders@dekker.com, INTERNET: http://www.dekker.com, Fax: (212)685-4540
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/35178

Aromatic Secondary Amines as Antioxidants for Polyolefins. Part 1. 9,10-Dihydroacridine (Acridan) Derivatives
POLYMER DEGRADATION AND STABILITY
Autore/i: Carloni, Patricia; L., Greci; A., Mar'In; Stipa, Pierluigi
Editore: Elsevier Applied Science:An Imprint of Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington Oxford OX5 1GB United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: nlinfo-f@elsevier.nl OR usinfo-f@elsevier.com OR forinfo-kyf04035@niftyserve.or.jp, INTERNET: http://www.elsevier.nl/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: A series of five acridan derivatives was studied as antioxidants in the thermoxidation of polypropylene. None induced major retardation in the polymer oxidation. Two of them, 9,9-diphenyl- and 9,9-dimethyl-acridans, showed synergism when used in the presence of dilauryl thiodipropionate (DLTP). In order to understand the role of the intermediate nitroxides during the oxidation, 9,9-diphenylacridan-1-oxyl was prepared and studied in the presence and in the absence of DLTP. The main reactivity of the nitroxide is explained through disproportionation and hydrogen abstraction reactions and formation of alkylated hydroxylamine, where the alkyl group is the polymer chain.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32452

Nitrenium Ions. Part 1. Acid Catalyzed Reactions of 2-Methylindole with Nitrosobenzenes. Crystal Structures of 2-Phenylamino-3-phenylimino-3H-indole, 2-(o-Tolylamino)-3-(o-tolylimino)-3H-indole, 2-Phenylamino-3H-(N-phenylimino-N-oxide)-3H-indole and 2,2'-Dimethyl-3,3'-diindolylmethane
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Cardellini, Liberato; Carloni, Patricia; Damiani, Elisabetta; L., Greci; Stipa, Pierluigi; C., Rizzoli; P., Sgarabotto
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53473

Hydrogen chloride treatment of quinolinic nitroxides. Part 2. Crystal structures of 1,2-dihydro-2,2-diphenyl-6-chloro- and of 1,2-dihydro-2,2-diphenyl-6,8-dichloro-quinoline.
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Cardellini, Liberato; Carloni, Patricia; Damiani, Elisabetta; L., Greci; Stipa, Pierluigi; C., Rizzoli; P., Sgarabotto
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52248

N-Nitrosodiphenylamine as an Alternative Nitrosating Agent for Indoles
SYNTHETIC COMMUNICATIONS
Autore/i: Cardellini, Liberato; L., Greci; Stipa, Pierluigi
Editore: Marcel Dekker Incorporated:270 Madison Avenue:New York, NY 10016:(800)228-1160, (212)696-9000, EMAIL: bookorders@dekker.com, INTERNET: http://www.dekker.com, Fax: (212)685-4540
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31943

Oxidative dimerization of quinolinic nitroxides in the presence of trichloro- and trifluoro-acetic acid. Crystal structures of 6,6'-bis-(1-oxide-1,2,6,8a-tetrahydroquinoline)ylidene and of 2,3-d-iphenylquinoline
TETRAHEDRON
Autore/i: Carloni, Patricia; Damiani, Elisabetta; Greci, L.; Stipa, Pierluigi; Rizzoli, C.; Sgarabotto, P.; Ugozzoli, F.
Classificazione: 1 Contributo su Rivista
Abstract: Quinolinic nitroxides 1a–c react with trichloro- (TCA) and trifluoro- (TFA) acetic acid to give dimers 3a–c and quinolines 4a–c as the main products. Products 3a–c are explained as arising via the intermediate formation of the radical cation 5, which forms the final dimer through an oxidative dimerization promoted by the TCA or TFA. The formation of products 4a–c is explained by a Wagner-Meerwein type transposition of the phenyl group from C-2 to C-3. The disproportionation, which generally occurs in the presence of acid for nitroxides having the NO function conjugated with a π-system, has been excluded even though quinoneimine N-oxides 2a–c were isolated. The structure of compounds 3a and 4a were determined by crystal X-ray analysis. Quinolinic nitroxides 1a–c react with trichloro- and trifluoro-acetic acid to give dimers 3a–c and quinolines 4a–c as the main products.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53211

Antioxidants and Light Stabilizers. Part 1. Reactions of an Indolinone Nitroxide and Phenoxy radicals. X-ray Cristallographic Analysis of 1-[O-(3,5-di-tert-butyl-4-hydroxy)-benzyl]-1,2-dihydro-2-methyl-2-phenyl-3-oxo-3H-indole and 3,5,3’,5’-Tetra-tert-butylstilbene-4,4’-quinone
POLYMER DEGRADATION AND STABILITY
Autore/i: Carloni, Patricia; L., Greci; Stipa, Pierluigi; C., Rizzoli; P., Sgarabotto; F., Ugozzoli
Editore: Elsevier Applied Science:An Imprint of Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington Oxford OX5 1GB United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: nlinfo-f@elsevier.nl OR usinfo-f@elsevier.com OR forinfo-kyf04035@niftyserve.or.jp, INTERNET: http://www.elsevier.nl/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: 2,6-di-tert-butyl-4-methylphenol and 2,6-di-tert-butylphenol undergo hydrogen abstraction from 1,2-Dihydro-2-methyl-2-phenyl-3-oxo-3H-indole-1-oxyl (nitroxide). In the former case the benzyl radical of the methylphenol gave the corresponding dimer and the alkylated hydroxylamine by coupling with the starting nitroxide. In the latter case only the 2,6-di-tert-butylbenzoquinone, the amine and the hydroxylamine corresponding to the starting nitroxide were obtained. In all other cases, in which the nitroxide was unable to give hydrogen abstraction from phenols, the phenoxy radicals were formed by lead dioxide oxidation of the corresponding phenols in the presence of the nitroxide. Except for 2,4,6-trimethylphenol, whose phenoxy radical formed with the nitroxide the alkylated hydroxylamine, all other phenoxy radicals reacted with the starting nitroxide giving ortho or para benzoquinones and the amine corresponding to the deoxygenated nitroxide. The structures of 1-[O-(3,5-di-tert-butyl-4-hydroxy)-benzyl]-1,2-dihydro-2-methyl-2-phenyl-3-ox o-3H-indole and of the 3,5,3',5'-tetra-tert-butylstilbene-4.4'-quinone, isolated by lead dioxide oxidation on 2,6-di-tert-butyl-4-methylphenol, were determined by X-ray analysis; their geometries are discussed in comparison with analogous compounds.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31651

Antioxidants and Light Stabilizers. Part 2. On the Thermal Stability of Indolinonic Nitroxides
POLYMER DEGRADATION AND STABILITY
Autore/i: A., Alberti; Carloni, Patricia; L., Greci; Stipa, Pierluigi; C., Neri
Editore: Elsevier Applied Science:An Imprint of Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington Oxford OX5 1GB United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: nlinfo-f@elsevier.nl OR usinfo-f@elsevier.com OR forinfo-kyf04035@niftyserve.or.jp, INTERNET: http://www.elsevier.nl/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: 1,2-Dihydro-2-methyl-2-phenyl-3-phenylimino-3H-indole-N-oxyl acts as a process stabilizer in the extrusion of polypropylene, its antioxidant activity being greater than that of the phenolic antioxidant pentaerythritol tetra[3-(4-hydroxy-3,5-di-tert-butylphenyl)propionate] (Anox 20 or Irgonox 1010). In view of the high temperatures employed in the extrusion processes, the thermal stability of seven 3-aryliminoindoline N-oxyls and seven 3-oxoindoline N-oxyls bearing different substituents in position 2 has been investigated. Only the two 2-methyl-2-phenyl-, the two 2-ethyl-2-phenyl-, and the two 2,2-diphenyl-substituted derivatives do not undergo significant decomposition at 200-degrees-C, while all other nitroxides are converted to the corresponding indolenine N-oxide and indolenines depending upon the temperature. The decomposition process appears to take place through initial loss of an R. radical from position 2, the rate constants varying with the nature of the R substituent. The ease of fragmentation of the nitroxides could be related to the BDE of the R-H bond of the hydrocarbon corresponding to the R substituent with the exception of the 2-butyl-2-phenyl substituted derivatives which undergo degradation much faster than expected.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31650

B-Phosphorylated Five Membered Ring Nitroxides. Synthesis and EPR Study
FREE RADICAL RESEARCH COMMUNICATIONS
Autore/i: Stipa, Pierluigi; P., Tordo; J. P., Finet; L., Dembkovski; C., Frejaville; F., LE MOIGNE; R., Maurin; A., Mercier; P., Pages
Editore: Harwood Academic Publishers:PO Box 90, Reading RG1 8JL United Kingdom:011 44 118 9560080, 011 44 118 9520303, EMAIL: philip.bott@gbmis.gbhap.com, INTERNET: http://www.edoc.com, Fax: 011 44 118 9568211
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32510

B-Phosphorylated Five Membered Ring Nitroxides. Synthesis and ESR Study of 2-Phosphonyl-4-(hydroxymethyl)pyrrolidine Aminoxyl Radicals
JOURNAL OF ORGANIC CHEMISTRY
Autore/i: Stipa, Pierluigi; P., Tordo; J. P., Finet; F., LE MOIGNE
Editore: [Washington, D.C: American Chemical Society
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31649

Synthesis and structural characterization of first metal complex with indole nitroxide.
POLYHEDRON
Autore/i: A. B., Burdukov; V. I., Ovcharenko; N. V., Pervukhina; V. N., Ikorski; L., Greci; Carloni, Patricia; Damiani, Elisabetta; Stipa, Pierluigi; C. V. A., Reznikov
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51228

On the use of 1,3-diphenylisobenzofuran (DPBF). Reaction with carbon and oxygen centered radicals in model and natural systems.
RESEARCH ON CHEMICAL INTERMEDIATES
Autore/i: Carloni, Patricia; Damiani, Elisabetta; L., Greci; Stipa, Pierluigi; Tanfani, Fabio; E. TARTAGLINI E. M., Wozniak
Editore: VSP International Science Publishers:Godfried van Seystlaan 47, 3703 BR Zeist Netherlands:011 31 30 6925790, EMAIL: vsppub@compuserve.com, INTERNET: http://www.vsppub.com, Fax: 011 31 30 6932081
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/38383

Theoretical Aspects of the Interaction between the Indole Radical Cation and Oxygen
JOURNAL OF CHEMICAL RESEARCH. SYNOPSES
Autore/i: Carloni, Patricia; L., Greci; Stipa, Pierluigi; M., Baginski; E., Borowski
Editore: -London: Chemical Society. -Middlesex United Kingdom: Scientific Reviews Limited
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31947

Chemical and electrochemical reduction of 2H-indole-3,5-dione and -dione 3-imine N-oxides.
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Carloni, Patricia; Damiani, Elisabetta; Greci, L.; Stipa, Pierluigi; Alberti, A.; Benaglia, M.; Marrosu, G.; Trazza, R. PETRUCCI E. A.
Classificazione: 1 Contributo su Rivista
Abstract: Five of the title N-oxides 1 when reduced either chemically (phenylhydrazine, hydrazobenzene) or electrochemically (DMF-TEAP-protonating agent) were found to afford the corresponding 5- hydroxyindoles 6. The reduction process takes place in two steps leading initially to 1.5- dihydroxyindoles 4 which undergo loss of water and are eventually converted into the products. EPR spectroscopic studies of the chemical and electrochemical reduction led to the characterization of the intermediate radical anions and neutral radicals, and a mechanism based on these results as well as on polarographic and cyclic voltammetric studies is proposed for the process.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52740

Conformational Study on Indoline Compounds. Structures of 2-phenyl-3-arylimino-3H-indole 1-oxide, 1,2-dihydro-2-phenyl-2-benzyl- and 2-tert-Butyl-3-phenylimino-3H-indole 1-oxyls
JOURNAL OF HETEROCYCLIC CHEMISTRY
Autore/i: C., Rizzoli; P., Sgarabotto; F., Ugozzoli; Carloni, Patricia; Damiani, Elisabetta; L., Greci; Stipa, Pierluigi
Editore: Hetero Corporation:PO Box 170:Provo, UT 84603:(801)400-7373, EMAIL: jhetchem@yahoo.com, Fax: (801)356-7373
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: Reacting 1-hydroxy-2-phenylindole with nitrosobenzene, 2-phenyl-3-phenylimino-3H-indole 1-oxide (1) is produced in only one of the two possible diastereomers. The latter reacts with tert-butylmagnesium chloride and benzylmagnesium chloride giving, after oxidation, the corresponding aminoxyls which show the same configuration of the phenylimino group at C-3 as in 1. This has been demonstrated by means of nmr spectroscopy and X-ray crystal structure and represents an unexpected stereospecific reaction.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31948

The Role of Oxygen in the Reduction of Tetrazolium Salts with NADH Mediated by 5-Methyl Phenazonium Methyl Sulphate. An EPR and Voltammetric Study
RESEARCH ON CHEMICAL INTERMEDIATES
Autore/i: Carloni, Patricia; L., Greci; E., Maurelli; Stipa, Pierluigi; M., Wozniak; G., Marrosu; R., Petrucci; A., Trazza
Editore: VSP International Science Publishers:Godfried van Seystlaan 47, 3703 BR Zeist Netherlands:011 31 30 6925790, EMAIL: vsppub@compuserve.com, INTERNET: http://www.vsppub.com, Fax: 011 31 30 6932081
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: The reduction of tetrazolium salts (namely INT, MTT and BNT) with NADH in the presence of catalytic amounts of PMS (5-methylphenazonium methylsulfate) was studied, and the influence of oxygen on the system was considered. The redox potentials of all the investigated compounds, the kinetic measurements, as well as the application of the Marcus theory confirmed that PMS and tetrazolium ions are reduced by NADH through an inner-sphere mechanism. The EPR investigations led to the detection of all possible radical species coming from PMS and tetrazolium ions and are in agreement with a mechanism which excludes any role of oxygen in the system NADH/PMS/tetrazolium for the formation of formazan.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31944

Synthesis of 3-Amino-2-oxo-1,2-oxaphospholanes and 3-Amino-2-oxo-1,2-oxaphosphorinanes
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
Autore/i: Stipa, Pierluigi; P., Tordo; J. P., Finet; C., Frejaville; R., Lauricella; F., LE MOIGNE
Editore: Taylor & Francis Limited:Rankine Road, Basingstoke RG24 8PR United Kingdom:011 44 1256 813035, EMAIL: madeline.sims@tandf.co.uk, info@tandf.co.uk, INTERNET: http://www.tandf.co.uk, Fax: 011 44 1256 330245
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31949

FT-IR and 1H-NMR Investigations on the Correlation between Stretching Vibration and the Chemical Shift of Indoles
Proceedings of the 2nd International Workshop on Fourier Transform Infrared Spectroscopy
Autore/i: Stipa, Pierluigi; Tosi, Giorgio; L., Greci; P., Bruni; Giorgini, Elisabetta; E., Maurelli
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: FT-IR and 1H-NMR Investigations on the Correlation between Stretching Vibration and the Chemical Shift of Indoles" con G. Tosi, L. Greci, P. Bruni, E. Giorgini ed E. Maurelli, Proceedings of the 2nd International Workshop on Fourier Transform Infrared Spectroscopy, 1992, 293
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/45307

Acid catalyzed rearrangements in the arylimino indoline series. Part IV. Reactions of 1,2-dihydro-2-phenyl-2-(indol-3-yl-derivatives)-3-phenylimino-3H-indole with trichloroacetic and hydrochloric acids. Crystal structure of 1,2-dihydro-2-phenyl-2-(indol-3-yl)-3-phenylimino-3H-indole
JOURNAL OF HETEROCYCLIC CHEMISTRY
Autore/i: B., Cardillo; Conti, Carla; Giorgini, Elisabetta; L., Greci; Stipa, Pierluigi; Tosi, Giorgio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/79954

DIRECT AMINATION. PART 4. REACTIONS OF INDOLES WITH PRIMARY AROMATIC AMINES AND IODOSOBENZENE DIACETATE, HETEROCYCLES
HETEROCYCLES
Autore/i: Cardellini, Liberato; Greci, L.; Maurelli, E.; Orena, M.; Stipa, Pierluigi; Tosi, G.
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36335

Direct Amination. Part IV. Reaction of Indoles with Primary Aromatic Amines and Iodosobenzene Diacetate
HETEROCYCLES
Autore/i: Cardellini, Liberato; L., Greci; E., Maurelli; Orena, Mario; Stipa, Pierluigi; G., Tosi
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53180

Acid Catalyzed Rearrangments in the Arylimino Indoline Series. Part IV. Reactions of 1,2-Dihydro-2-phenyl-2-(indol-3-yl-derivatives)-3-phenylimino-3-H-indole with Trichloroacetic and Hydrochloric Acids. Crystal Structure of 1,2-Dihydro-2-phenyl-2-(indol-3-yl)-3-phenylimino-3H-indole
JOURNAL OF HETEROCYCLIC CHEMISTRY
Autore/i: B., Cardillo; C., Conti; Giorgini, Elisabetta; L., Greci; Stipa, Pierluigi; G., Tosi; C., Rizzoli; P., Sgarabotto; F., Ugozzoli
Editore: Hetero Corporation:PO Box 170:Provo, UT 84603:(801)400-7373, EMAIL: jhetchem@yahoo.com, Fax: (801)356-7373
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31951

Electron Transfer Reactions. A Reinvestigation of the Chlorination of 1-Methyl-2-phenylindole with N-Chlorobenzotriazole. The Role of Oxygen and Oxygenated Solvent
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Carloni, Patricia; L., Eberson; L., Greci; Stipa, Pierluigi; Tosi, Giorgio
Editore: Royal Society of Chemistry:Thomas Graham House, Science Park, Cambridge CB4 0WF United Kingdom:011 44 1223 432360, EMAIL: sales@rsc.org, INTERNET: http://www.rsc.org, http://www.chensoc.org, Fax: 011 44 1223 423429
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: 1-Methyl-phenylindole (1, MPI-H) reacts with N-chlorobenzotriazole (2, BT-Cl) to form the corresponding radical cation (MPI-H).+ which itself, or via the indolyl radical (MPI).+, formed by deprotonation of MPI-H.+, reacts with oxygen or a nucleophilic solvent leading to indoxyls 4-7. Cyclic voltammetric studies, as well as the oxidation of MPI-H with BT-Cl carried out in the EPR cavity, show that the radical cation MPI-H.+ dimerizes to give 3,3'-(MPI)2 8 which is transformed into the corresponding radical cation 3,3'-(MPI)2.+ in the reaction medium. The identity of this radical cation has been confirmed by oxidizing 3,3'-(MPI)2 directly. The formation of the radical cations MPI-H.+ and 3,3'-(MPI)2.+ has been monitored by UV-VIS spectroscopy and their decay rate constants measured.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31752

Electron-transfer reactions. Oxidation of Grignard reagents in the presence of an aminoxyl as a radical-trapping agent
JOURNAL OF ORGANIC CHEMISTRY
Autore/i: Carloni, Patricia; Greci, L.; Stipa, Pierluigi; Eberson, L.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50232

Chemical and Electrochemical Reduction of ortho-Nitroanilides. A Combined Chemical, Polarographic and EPR Study
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: A., Alberti; Carloni, Patricia; L., Greci; Stipa, Pierluigi; R., Andruzzi; G., Marrosu; A., Trazza
Editore: Royal Society of Chemistry:Thomas Graham House, Science Park, Cambridge CB4 0WF United Kingdom:011 44 1223 432360, EMAIL: sales@rsc.org, INTERNET: http://www.rsc.org, http://www.chensoc.org, Fax: 011 44 1223 423429
Classificazione: 1 Contributo su Rivista
Abstract: Abstract: The acetyl and benzoyl o-nitroanilines 1a and 1b and the acetyl and benzoyl o-nitrodiphenylamines 1c and 1d have been reduced chemically (Bu(t)OK/DMSO) and electrochemically inside the cavity of an EPR spectrometer. For all compounds the EPR signal of the radical anions could be recorded and interpreted. In DMSO the radical anions 1c.- and 1d.- evolved to the phenazine radical anion within 1 h. The polarographic study showed that the four compounds are reduced in two different steps, the first being monoelectronic and reversible, as demonstrated by cyclic voltammetric experiments.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/33679

Competition between Nucleophilic Attack and Electron Transfer in the Reaction of Indoledione Imine N-Oxides with Primary Aromatic Amines
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Carloni, Patricia; L., Greci; Stipa, Pierluigi; A., Alberti; C., Rizzoli; P., Sgarabotto; F., Ugozzoli
Editore: Royal Society of Chemistry:Thomas Graham House, Science Park, Cambridge CB4 0WF United Kingdom:011 44 1223 432360, EMAIL: sales@rsc.org, INTERNET: http://www.rsc.org, http://www.chensoc.org, Fax: 011 44 1223 423429
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/33681

Fenton's Reagent in Dimethyl Sulphoxide: an Unusual Sulphonylating System. X-ray Crystallographic Analysis of 4-N,N-dimethylamino-N,N-dimethane-sulphonylaniline
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II
Autore/i: Cardellini, Liberato; L., Greci; Stipa, Pierluigi; C., Rizzoli; P., Sgarabotto; F., Ugozzoli
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52241

Conformational Study on 4-(Dimethylamino)methanesulfonanilides. 1. Structures of 2-Methanesulfonyl- (I), 3-Methanesulfonyl- (II) and 2-Methanesulfonyl-3-methyl-4-(dimethylamino)methanesulfoanilide (III
ACTA CRYSTALLOGRAPHICA. SECTION C, CRYSTAL STRUCTURE COMMUNICATIONS
Autore/i: C., Rizzoli; P., Sgarabotto; F., Ugozzoli; Cardellini, Liberato; L., Greci; Stipa, Pierluigi
Editore: Blackwell Munksgaard:PO Box 2148, Periodicals Department, DK-1016 Copenhagen K Denmark:011 45 33 755913, EMAIL: agentservices@oxon.blackwellpublishing.com, INTERNET: http://www.blackwellmunksgaard.com, Fax: 011 45 77 333377
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31608

Homolytic Substitutions in Indolinone Nitroxide Radicals. Part 5. Reaction with tert-Butylperoxy Radicals
GAZZETTA CHIMICA ITALIANA
Autore/i: Cardellini, Liberato; Carloni, Patricia; L., Greci; Stipa, Pierluigi; A., Faucutano
Editore: Bardi editore Societa Chimica Italiana:Viale Liegi 48, 00198 Rome Italy:011 39 06 8549691, EMAIL: soc.chim.it@agora.stm.it, Fax: 011 39 06 8548734
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31538

On the Application of Indolinonic Nitroxides
PHYSICA MEDICA
Autore/i: Cardellini, Liberato; Carloni, Patricia; L., Greci; Stipa, Pierluigi
Editore: UK: Elsevier Pisa: Istituti Editoriali e Poligrafici Internazionali. Pisa Italy: Giardini Editori Stampatori
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/33682

X-ray Study of 3-tert-butyl-1-methyl-2-phenylindole, the product of an Unexpected tert-Butylation Reaction
ACTA CRYSTALLOGRAPHICA. SECTION C, CRYSTAL STRUCTURE COMMUNICATIONS
Autore/i: P., Sgarabotto; F., Ugozzoli; L., Greci; Stipa, Pierluigi; Carloni, Patricia
Editore: Blackwell Munksgaard:PO Box 2148, Periodicals Department, DK-1016 Copenhagen K Denmark:011 45 33 755913, EMAIL: agentservices@oxon.blackwellpublishing.com, INTERNET: http://www.blackwellmunksgaard.com, Fax: 011 45 77 333377
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31546

The Reaction of 1,1,2,2,-ethenetetracarbonitrile (TCNE) with Aminopyridines: Salt and Charge Transfer Complexes Formation
SPECTROCHIMICA ACTA. PART A, MOLECULAR SPECTROSCOPY
Autore/i: P., Bruni; G., Tosi; Cardellini, Liberato; Giorgini, Elisabetta; Stipa, Pierluigi
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31541

Imidazo[2,1-b]thiazole Carbamates and Acylureas as Potential Insect Control Agents
JOURNAL OF HETEROCYCLIC CHEMISTRY
Autore/i: A., Andreani; M., Rambaldi; Carloni, Patricia; L., Greci; Stipa, Pierluigi
Editore: Hetero Corporation:PO Box 170:Provo, UT 84603:(801)400-7373, EMAIL: jhetchem@yahoo.com, Fax: (801)356-7373
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31540

The reaction of 1,1,2,2-ethenetetracarbonitrile (TCNE) with aminopyridines: salts and charge transfer complex formation
SPECTROCHIMICA ACTA. PART A, MOLECULAR SPECTROSCOPY
Autore/i: P., Bruni; Tosi, Giorgio; Cardellini, Liberato; Giorgini, Elisabetta; Stipa, Pierluigi
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/79973

Molecular Complexes between Benzamidopyridines and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)
GAZZETTA CHIMICA ITALIANA
Autore/i: G., Tosi; P., Bruni; Cardellini, Liberato; Stipa, Pierluigi; G., Bocelli; C., Rizzoli
Editore: Bardi editore Societa Chimica Italiana:Viale Liegi 48, 00198 Rome Italy:011 39 06 8549691, EMAIL: soc.chim.it@agora.stm.it, Fax: 011 39 06 8548734
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31539

2,2'-Diphenyl-Δ3,3'-bi-3H-indole-1,1-dioxide: Molecular Interactions and Crystal Structure
MONATSHEFTE FÜR CHEMIE
Autore/i: G., Tosi; Stipa, Pierluigi; G., Bocelli
Editore: WIEN, AUSTRIA:SPRINGER WIEN
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31543

Radical Cations. Part 2. Oxidative Dimerization of Indolizines: A Chemical and Electrochemical Investigation
JOURNAL OF THE CHEMICAL SOCIETY. PERKIN TRANSACTIONS. I
Autore/i: R., Andruzzi; Cardellini, Liberato; L., Greci; Stipa, Pierluigi; M., Poloni; A., Trazza
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52739

Chemical and Electrochemical Synthesis of Quinoneimine N-oxides from Indolinone-3-arylimino Nitroxide Radicals
TETRAHEDRON
Autore/i: A., Alberti; R., Andruzzi; L., Greci; Stipa, Pierluigi; G., Marrosu; A., Trazza; M., Poloni
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31544

Direct Amination. Part 3. Reaction of Indole and 2-methylindole with Primary Aromatic Amines
JOURNAL OF CHEMICAL RESEARCH. SYNOPSES
Autore/i: L., Greci; Stipa, Pierluigi; G., Tosi
Editore: -London: Chemical Society. -Middlesex United Kingdom: Scientific Reviews Limited
Classificazione: 1 Contributo su Rivista
Abstract: J. Chem. Research Miniprint, 1987, 217; (M), 1987, 1967.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31545

Homolytic Substitution in Indolinone Nitroxides - IV. Reactions with Aminyl Radicals. A Spectroscopic and Crystallographic Study
TETRAHEDRON
Autore/i: A., Alberti; L., Greci; Stipa, Pierluigi; P., Sgarabotto; F., Ugozzoli
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/31653