手性聚合Salen-Mn(Ⅲ)配合物的合成及其催化性能

Preparation and enantioselective epoxidation catalysis of chiral oligomeric Salen-Mn(III) complex

合成了新型二聚水杨醛衍生物,将其与(1R,2R)-环己二胺缩合制备出手性聚合Salen配体,该配体再与Mn3+配位制得手性聚合Salen-Mn(Ⅲ)配合物。利用FT-IR、UV-Vis等手段对配体和配合物进行了表征。分别以NaClO和间氯过氧苯甲酸(m-CPBA)为氧化剂,考察了该Salen-Mn(Ⅲ)配合物催化烯烃不对称环氧化反应的性能。结果表明,该配合物对顺-β-甲基苯乙烯的不对称环氧化反应具有很好的催化性能,产物选择性达98%,ee值达80%。以顺-β-甲基苯乙烯为底物,m-CPBA为氧化剂时,该配合物可循环使用3次。

A novel chiral oligomeric Salen ligand was synthesized by the reaction of a novel dialdehyde with （ 1R ,2R） - 1,2 - diaminocyclohexane. From this hgand, the chiral oligomeric Salen - Mn（Ⅲ） complex was prepared. The new ligand and complex were characterized by FT - IR and UV - Vis spectroscopy. The complex was used as the catalyst for the asymmetric epoxidation of olefins using NaC10 and m - CPBA as the oxidants, respectively. In the asymmetric epoxidation of cis -β - methylstyrene, the selectivity and ee for the epoxides reached 98% and 80%, respectively. The catalyst can be reused for three times.