Preparation Of Mcm-41 Supported Heterogenized Chiral Salen Mn (iii) Complex And The Catalytic Activity In The Asymmetric Epoxidation

摘要

A chiral Manganese (III) salen complex was immobilized on the walls of MCM-41 (mobile crystalline material) through the multi-grafting method. The immobilized complex was characterized by XRD, FTIR, UV-Vis, ICP and Nitrogen sorption, and was applied to the asymmetric epoxidation of unfuctionalized alkenes including 1,2-dihydronaphthalene, α-methylstyrene, cis-β-methylstyrene, styrene using NaClO and m-chloroper-benzoic acid (m-CPBA) as oxidants respectively. The immobilized complex showed good activity and enanti-oselectivity in the epoxidation of 1,2-dihydronaphthalene by using NaCIO as oxidant. It could also be run for 4 times in the epoxidation of a-methylstyrene without obvious loss of activity or enantiomeric excess.