Effect of the chemical structure of nitroxyl radicals on their reactivity in the reaction with hydrazobenzene and tetranitromethane
作者:A. D. Malievskii、S. V. Koroteev、L. B. Volodarskii、A. B. Shapiro
DOI:10.1007/bf00958847
日期:1990.11
The reaction rate constants of reduction of stable radicals of different classes by hydrazobenzene in hexane at approximately 20-degrees-C, in the range of 0.4-5.10(3) M-1.sec-1, were determined; a single scale of the oxidative properties of stable nitroxyl radicals was constructed. The rate constants of oxidation of a series of nitroxyl radicals by tetranitromethane in aqueous medium at approximately 20-degrees-C, in the range of 0.06-10 M-1.sec-1, were determined. It was shown that the oxidative properties of the nitroxyl group decrease slightly with an increase in its reducing properties for nitroxyl radicals of the piperidine and imidazoline series in reactions with ascorbic acid and tetranitromethane in aqueous medium, respectively.
The exchange reaction of hydrogen atoms in the system sterically hindered hydroxylamine-nitroxyl radical
作者:A. D. Malievskii、S. V. Koroteev
DOI:10.1007/bf02495549
日期:1998.7
direct and reverse exchange reactions of the hydrogen atom in the system sterically-hindered nitroxyl radical-hydroxylamine of the quinoline, imidazoline, pyrrolidine, and piperidine series as well as diarylhydroxylamine were determined. A scale of the reductive abilities of the hydrolamines was established. A low value of the isotope effect is typical of the reactions of hydrogen exchange in the systems