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Addition of radicals to quinones. ESR study of some radical reactions of 3,3′,5,5′-tetra-tert-butylstilbene-4,4′-quinone

✍ Scribed by Tatiana L. Simándi; Antal Rockenbauer; LászlóI. Simándi

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 316 KB
Volume: 31
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(94)00207-x

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✦ Synopsis

IReactions

of 3,3',5,5'-tetra-ferz-butylstilbene-4,4'-quinone with free radicals from the decomposition of azo compounds and peroxides (R') have been studied by ESR spectroscopy. Relatively stable phenoxyl+,pe free radicals are formed via addition of R' across the exo C=C bond. Their coupling constants with the methine proton reflect steric effects. Further addition products lead to sterically crowded molecules which spontaneously dissociate into radicals via C(4)-C(7) bond cleavage.

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