Preparation of MCM-41-supported chiral Salen Mn (III) catalysts and their catalytic properties in the asymmetric epoxidation of olefins  

作　　者：ZHAO DongMin ZHAO JiQuant ZHAO ShanShan HE LeQin WANG WeiYu 

机构地区：[1]School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China

出　　处：《Chinese Science Bulletin》2007年第17期2337-2344,共8页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 20376017)

摘　　要：A secondary amino-modified mesoporous molecular sieve MCM-41 was obtained by reaction of bis(3-(triethoxysilyl)propyl)amine with MCM-41. The chiral Salen-Mn (III) complex was anchored onto the modified MCM-41 by a multi-step grafting method and two heterogenized catalysts with different Mn contents were obtained. The catalysts were characterized by XRD, N2 adsorption, ICP, FT-IR and DR UV-Vis. Their catalysis on asymmetric epoxidation of several olefins was studied with NaClO and m-CPBA as oxidants respectively. It was found that both the activity and enantioselectivity of the cata- lysts decreased after the homogeneous catalyst was heterogenized. The reasons resulting in the de- crease of catalytic performance were discussed.A secondary amino-modified mesoporous molecular sieve MCM-41 was obtained by reaction of bis（3-（triethoxysilyl）propyl）amine with MCM-41. The chiral Salen-Mn （Ⅲ） complex was anchored onto the modified MCM-41 by a multi-step grafting method and two heterogenized catalysts with different Mn contents were obtained. The catalysts were characterized by XRD, N2 adsorption, ICP, FT-IR and DR UV-Vis. Their catalysis on asymmetric epoxidaUon of several olefins was studied with NaCIO and m-CPBA as oxidants respectively. It was found that both the activity and enantioselectivity of the catalysts decreased after the homogeneous catalyst was heterogenized. The reasons resulting in the decrease of catalytic performance were discussed.

关 键 词：分子筛 MCM-41 不对称环氧化作用 Α-甲基苯乙烯 锰 手性化合物 

分 类 号：TQ424.25[化学工程]