【摘要】 在硅烷化硅胶上涂敷手性高分子配位体三苯基氨基甲酸纤维素酯和三 (3,5 -二甲基苯基氨基甲酸 )纤维素酯 ,然后与 Pd Cl2 配位 ,制备一种新型的负载型不对称加氢催化剂 .该催化剂用于苯乙酮的加氢反应 ,醇收率最高达 10 0 % ,但产物的对映选择性较低 ;初步考察了催化剂对映选择性较低的原因 .更多还原

【Abstract】 In this paper study on synthesis of a new supported chiral palladium catalyst was reported. Chiral macromolecular ligands , cellulose triphenylcarbamate and cellulose tris(3,5 dimethylphenyl carbamate), were coated on macroporous siliconited silica gel. The complexation of PdCl 2 with cellulose triphenylcarbamate or cellulose tris (3,5 dimethylphenyl carbamate) formed the title catalysts. These catalysts system were used in asymmetric hydrogenation of acetophenone to sec phenylethyl alcohol, the highest optical yield of 12.3% is obtained when a catalyst system containing cellulose tris(3,5 dimethylphenylcarbamate) was used. Reason of low enantioselectivity of the catalyst was discussed.更多还原