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Mechanism of the Antiradical Action of Natural Phenylpropanoids in Nonionizing Polar Media
Kinetics and Catalysis  (IF1),  Pub Date : 2020-12-28, DOI: 10.1134/s0023158420060026
N. I. Belaya, A. V. Belyi, A. A. Davydova

Abstract

The kinetics and mechanisms of the reactions of some natural phenylpropanoids from the group of hydroxycinnamic acids with the stable radical 2,2'-diphenyl-1-picrylhydrazyl in polar nonionizing media were studied by kinetic and spectrophotometric methods. The kinetic and stoichiometric parameters of the reaction were determined. The magnitude of the deuterium isotope effect shows that in polar solvents with low ionizing ability (dimethylsulfoxide), the reaction proceeds by the electron transfer mechanism followed by proton transfer. A similar mechanism of the antiradical action of hydroxycinnamic acids is possible in highly acidic aqueous media.