化学
激进的
碘苯
邻苯二甲酰亚胺
反应速率常数
光化学
羟胺
苯
溶剂
药物化学
动力学
有机化学
催化作用
量子力学
物理
作者
О. V. Kushch,I. O. Hordieieva,Katerina V. Novikova,Yurii E. Litvinov,M. O. Kompanets,A. N. Shendrik,I. A. Opeida
标识
DOI:10.1021/acs.joc.0c00506
摘要
N-oxyl radicals of various structures were generated by oxidation of corresponding N-hydroxy compounds with iodobenzene diacetate, [bis(trifluoroacetoxy)]iodobenzene, and ammonium cerium(IV) nitrate in acetonitrile. The decay rate of N-oxyl radicals follows first-order kinetics and depends on the structure of N-oxyl radicals, reaction conditions, and the nature of the solvent and oxidant. The values of the self-decay constants change within 1.4 × 10–4 s–1 for the 3,4,5,6-tetraphenylphthalimide-N-oxyl radical to 1.4 × 10–2 s–1 for the 1-benzotriazole-N-oxyl radical. It was shown that the rate constants of the phthalimide-N-oxyl radicalsʼ self-decay with different electron-withdrawing or -donor substituents in the benzene ring are higher than that of the unsubstituted phthalimide-N-oxyl radical in most cases. The solvent effect on the process of phthalimide-N-oxyl radical self-decomposition was investigated. The dependence of the rate constants on the Gutmann donor numbers was shown.
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