Realization of a silica supported chiral catalyst with very high efficiency is showed

A surface-confined O[double bond, length as m-dash]MnV(salen) oxene catalyst and high turnover values in asymmetric epoxidation of unfunctionalized olefins

Given the widespread importance of chiral epoxides in chemical, biochemical and agricultural fields, an efficient synthesis that avoids wasteful use of the catalyst and assures its total recovery and reuse and high turnover values is highly desirable. We report on a thermally and temporally robust covalent monolayer of (salen)Mn(III) molecules on silica functionalized substrates that resulted in an active heterogeneous catalyst for enantioselective epoxidation of 6-ciano-2,2-dimethyl-chromene