A number of unfunctionalized aromatic and aliphatic olefins was tested
in ruthenium-catalyzed epoxidation with tert-butyl hydroperoxide as t
he external oxidant. The effect of reaction without ligands and with t
wo different type of ligands was investigated. Olefins containing term
inal double bonds afforded low epoxide selectivities, whereas secondar
y and tertiary olefins afforded up to 80% selectivity for the epoxide.
A mechanism for the ruthenium-catalyzed epoxidation with tert-butyl h
ydroperoxide is proposed. Copyright (C) 1996 Elsevier Science Ltd