Mass Spectrometry and Electron Paramagnetic Resonance Study of Free Radicals Spontaneously Formed in Nitrone−Peracid Reactions
作者:Hong Sang、Edward G. Janzen、Brian H. Lewis
DOI:10.1021/jo952031w
日期:1996.1.1
Reactions of spin traps (C-phenyl N-tert-butyl nitrone (PEN) and 5,5-dimethyl-2-phenyl-1-pyrroline N-oxide (2-Ph-DMPO)) with peracids have been investigated by both mass spectrometry (MS) and electron paramagnetic resonance(EPR). The peracids m-chloroperbenzoic acid, perbenzoic acid, and perpropionic acid, which can be considered models of biological peracids produced during lipid peroxidation, were found to react with spin traps to spontaneously produce significant amount of aminoxyl radicals, The radical products, as well as the nonradical products were detected and their structures identified by EPR and/or MS. Mechanisms for the formation of these products are proposed.