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.

中文翻译：

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天然苯丙烷类化合物在非电离极性介质中的抗自由基作用机理

摘要

通过动力学和分光光度法研究了羟基肉桂酸中的一些天然苯基丙烷类化合物与稳定的自由基2,2'-二苯基-1-甲基肼基在自由基非电离介质中反应的动力学和机理。确定了反应的动力学和化学计量参数。氘同位素效应的大小表明，在离子化能力低的极性溶剂（二甲亚砜）中，反应通过电子转移机理进行，然后进行质子转移。在高度酸性的水性介质中，羟基肉桂酸的抗自由基作用的类似机理也是可能的。