Photo-oxidation of alcohols by hexachlorometalate(IV) ions (M = Pt, Pd, or Ir): spin trapping and matrix isolation electron spin resonance studies
作者:Anand G. Fadnis、Terence J. Kemp
DOI:10.1039/dt9890001237
日期:——
Spin-trapping studies reveal that whereas the mild (λ > 380 nm) photolysis of ions [MCl6]2–(M = Pd, Pt, or Ir) in alcohol (RCH2OH)-water mixtures leads invariably to RĊHOH, in pure alcoholic media many of the oxidations lead to RCH2[graphic omitted]. Prolonged, wide-band photolysis leads to the production of H atoms. At 77 K, wide-band photolysis leads to the production of platinum(III) and palladium(III)
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.