Reactivities and Products of Free Radical Oxidation of Cholestadienols
作者:Libin Xu、Ned A. Porter
DOI:10.1021/ja5011674
日期:2014.4.9
them, dienols leading to the formation of the pentadienylradical in ring B (termed endo-B) of the sterol are more reactive than those leading to the pentadienylradical spanning rings B and C (termed exo-B). By comparing the oxysterol profile formed from 7-DHC and those formed from 8-DHC and 5,8(14)-dienol, products formed fromabstraction of the hydrogen atoms at C-9 and C-14 (H-9 or H-14 mechanism)
Oxysterols from Free Radical Chain Oxidation of 7-Dehydrocholesterol: Product and Mechanistic Studies
作者:Libin Xu、Zeljka Korade、Ned A. Porter
DOI:10.1021/ja9080265
日期:2010.2.24
In either the H-9 or H-14 mechanism, a pentadienyl radical intermediate is formed after abstraction of H-9 or H-14 by a peroxyl radical. This step is followed by the well-precedented transformations observed in peroxidation reactions of polyunsaturated fatty acids such as oxygen addition, peroxyl radical 5-exo cyclization, and S(H)i carbon radical attack on the peroxide bond. The mechanism for peroxidation