Immobilization of (tartrate-salen)Mn(III) polymer complexes into SBA-15 for catalytic asymmetric epoxidation of alkenes
作者:Yihong Jia、Zeid A. ALOthman、Rui Liang、Shuangshuang Cha、Xiaoyong Li、Weiyi Ouyang、Aqun Zheng、Sameh M. Osman、Rafael Luque、Yang Sun
DOI:10.1016/j.mcat.2020.111146
日期:2020.11
determined by salen chirality but e.e. values could be improved when tartrate and salen were configurationally identical. Combinations of (R,R)-salen with (R,R)-tartrate usually offered higher enantioselectivities. SBA-15 was satisfactory supporting material due to the high enantioselectivities and recycling yields obtained. The synthesized SBA-15-supported (tartrate-salen)Mn(III) catalysts showed continuous
制备了一系列(酒石酸-salen)Mn(III)聚合物配合物,并固定在SBA-15中,随后用作烯烃的不对称环氧化反应的催化剂。1 H NMR,FT-IR,UV-vis,元素分析,GPC和ICP-AES证明了聚合物配合物的成功合成,而粉末XRD,氮物理吸附和XPS研究证明了将聚合物配合物固定在SBA-15中。均相和非均相催化均表明,主要环氧化物产物的构型仍由salen手性确定,但当酒石酸盐和salen构型相同时,ee值可提高。(R,R)-salen与(R,R的组合酒石酸盐通常提供更高的对映选择性。SBA-15是令人满意的支撑材料,因为它具有很高的对映选择性和回收率。合成的SBA-15负载(酒石酸水杨酸)Mn(III)催化剂对α-甲基苯乙烯的环氧化反应显示出连续的高对映选择性,表明了大规模生产的广阔前景。