Acyl nitroxides. Part 4. Estimation of OH bond dissociation energies for N-t-butylhydroxamic acids
作者:Terence C. Jenkins、M. John Perkins
DOI:10.1039/p29830000717
日期:——
constants for the hydrogen exchange reactions between N-t-butylhydroxamicacids and the stable piperidine N-oxyl (1); since the O–H bond strength in (1)-H is known, this gives an estimate of the O–H bond strengths in the hydroxamic acids. These are found to be stronger than those in dialkyl nitroxide and increase with increasing electron demand in the acyl group.
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.
Spontaneous free-radical formation in reactions of m-chloroperbenzoic acid with C-phenyl-N-tert-butylnitrone (PBN) and 3- or 4-substituted PBN's
作者:Edward G. Janzen、Chiou Rong Lin、Randall D. Hinton
DOI:10.1021/jo00032a002
日期:1992.3
A molecular reaction between m-chloroperbenzoic acid and C-phenyl-N-tert-butylnitrone (PBN) produces significant amounts of aminoxyl radicals assigned to the m-chlorobenzoyloxyl adduct of PBN and benzoyltert-butylaminoxyl.