Preparation of MCM-41 Supported Heterogenized Chiral Salen Mn (III) Complex and the Catalytic Activity in the Asymmetric Epoxidation |
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Authors: | Dongmin Zhao Jiquan Zhao Shanshan Zhao Weiyu Wang |
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Affiliation: | (1) School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, P.R. China |
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Abstract: | 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-chloroperbenzoic acid (m-CPBA) as oxidants respectively. The immobilized complex showed good activity and enantioselectivity in the epoxidation of 1,2-dihydronaphthalene by using NaClO as oxidant. It could also be run for 4 times in the epoxidation of α-methylstyrene without obvious loss of activity or enantiomeric excess. |
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Keywords: | MCM-41 immobilized chiral Salen Mn(III) complex Asymmetric epoxidation α -methylstyrene 1,2-dihydronaphthalene |
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