手性铜(Ⅱ)-席夫碱配合物催化苯乙烯不对称环丙烷化反应

Twelve chiral copper(Ⅱ) Schiff base complexes, derived from (R) (+) 2 amino 1,1 diaryl 1 propanol with substituted salicylaldehydes, were examined as a catalyst for asymmetric cyclopropanation of styrene with ethyl diazoacetate. It was found that the substituents at 3 and 5 positions of salicylaldehyde in the ligands had great effects on catalytic activity and enantioselectivity of the catalyst. The complex with strong electron withdrawing group (NO 2) at 5 position and the smallest stereo hinder (H) at 3 position of salicylaldehyde showed highly catalytic activity and enantioselectivity, up to ee =87 4% for trans and ee =82 8% for cis isomers respectively, and the ratio 39/61 of cis to trans isomers was obtained at 40 ℃ with 1,2 dichloroethane as solvent.     

聚合Salen-Ti(Ⅳ)配合物对芳香醛不对称硅腈化反应的催化作用

 研究了聚SalenD－Ti（Ⅳ）配合物对芳香醛不对称硅腈化反应的催化作用．考察了催化剂用量、溶剂和温度对苯甲醛不对称硅腈化反应的影响，在－40℃和1．0mol催化剂量下，以4－Cl－C6H4CHO为底物，获得了ee值为82％和收率为98％的加成产物．探讨了聚SalenD－Ti（Ⅳ）上取代基对芳香醛硅腈化反应产物光学异构体选择性的影响．在20℃下，催化剂可重复使用多次而反应活性和对映体选择性保持不变．     

基于双酚A的希夫碱型锌配位聚合物的合成及发光性能

以双酚A为原料合成了具有对称的桥联结构的双水杨醛,在此基础上合成了一系列的双希夫碱配体及相应的锌配位聚合物.利用红外吸收光谱、核磁共振等方法研究了化合物的分子结构,利用热重分析研究了配合物的热稳定性,利用紫外吸收、荧光光谱研究了该系列配合物的发光性能,利用循环伏安法测试了配合物的能级带隙.研究结果表明:该系列配合物具有...