多相化Salen-Mn(Ⅲ)配合物的制备及其催化性能

Preparation and enantioselective epoxidation catalysis of anchored heterogeneous Salen-Mn(Ⅲ) complex

采用化学键联和溶胶-凝胶相结合的方法制备锚链固定的多相化Salen-Mn(Ⅲ)催化剂,利用FT-IR,UV-vis,1H NMR等方法对催化剂及其前体进行表征。考察了该催化剂催化烯烃不对称环氧化反应及其循环使用的性能,实验发现,多相化催化剂催化活性有所降低,但延长了反应时间后,催化顺-β-甲基苯乙烯不对称环氧化的转化率达到95%,其环氧化产物的对映体过量值(ee值)为60%。

Heterogeneous Salen-Mn （Ⅲ） catalyst was prepared by chemical linkage and sobgel entrapping method. The catalyst and its precursor were characterized by means of FT-IR , UV-vis and 1 H NMR. It was applied as catalyst in olefins enantioselective epoxidation. It was found that the activity decreased sharply after the chiral complex was immobilized. But by prolonging reaction time in epoxidation of cis-β-methylstyrene, 95% conversion and 60 % ee were also obtained.