Chiral Mn(Ⅲ) salen complex immobilized on imidazole-modified mesoporous material via co-condensation method as an effective catalyst for olefin epoxidation  

作　　者：LOU LanLan1, YU Yi1, YU Kai2, JIANG Shu1, DONG YanLing1 & LIU ShuangXi1 1 Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071, China 2 College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China 

出　　处：《Science China Chemistry》2009年第9期1417-1422,共6页中国科学（化学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 20773069);the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 200800551017)

摘　　要：An imidazole modified mesoporous material has been prepared through a co-condensation procedure and adopted to covalently anchor chiral Mn(Ⅲ) salen complex. The active centers in the as-synthesized catalyst were presented in the form of ionic species. The results of XRD, FTIR, DRUV-Vis, and N2 sorp-tion confirmed the successful immobilization of chiral Mn(Ⅲ) salen complex inside the channels of the modified support and the maintenance of the mesoporous structure of parent support in the immobi-lized catalyst. This heterogeneous catalyst exhibited comparable catalytic activity and enantioselectiv-ity to those of the homogeneous counterpart in the asymmetric epoxidation of unfunctionalized olefins. Furthermore, notably high turnover frequencies have been obtained over this heterogeneous catalyst for the relatively short reaction time and low catalyst amount, due in part to the ionic property as well as the uniform distribution of the active centers.An imidazole modified mesoporous material has been prepared through a co-condensation procedure and adopted to covalently anchor chiral Mn(Ⅲ) salen complex. The active centers in the as-synthesized catalyst were presented in the form of ionic species. The results of XRD, FTIR, DRUV-Vis, and N2 sorp-tion confirmed the successful immobilization of chiral Mn(Ⅲ) salen complex inside the channels of the modified support and the maintenance of the mesoporous structure of parent support in the immobi-lized catalyst. This heterogeneous catalyst exhibited comparable catalytic activity and enantioselectiv-ity to those of the homogeneous counterpart in the asymmetric epoxidation of unfunctionalized olefins. Furthermore, notably high turnover frequencies have been obtained over this heterogeneous catalyst for the relatively short reaction time and low catalyst amount, due in part to the ionic property as well as the uniform distribution of the active centers.

关 键 词：imidazole-functionalized mesoporous material CHIRAL Mn(Ⅲ) salen complex CO-CONDENSATION asymmetric EPOXIDATION unfunctionalized OLEFINS 

分 类 号：O643.3[理学—物理化学]