作者:Alan Armstrong、Paul A. Barsanti、Paul A. Clarke、Anthony Wood
DOI:10.1016/0040-4039(94)88103-0
日期:1994.8
Ketone carbonyl groups are shown to direct the epoxidation of cyclic alkenes with higher selectivity than that displayed by esters. An 18O labelling study is used to show that a dioxiraneintermediate is not involved in these reactions.
Ketone-directed peracid epoxidation of cyclic alkenes
作者:Alan Armstrong、Paul A. Barsanti、Paul A. Clarke、Anthony Wood
DOI:10.1039/p19960001373
日期:——
Ketone carbonyl groups are shown to direct the peracidepoxidation of cyclic alkenes with greater selectivity than that displayed by esters. An 18O labelling study is used to show that a dioxirane intermediate is not involved in these reactions.
Substrate-imposed steric constraints can be overriden by the pronounced preference of strong peracids for epoxidation on the π face, which has the highest electron density. For example, the syn:anti ratio for reaction (1) with CF3 CO3 H in CH2 Cl2 is 82:18, that with CH3 CO3 H in toluene is 3:97.