Chiral ligands with achiral backbones such as ethano- or ferroceno-bridges linking two phosphonites derived from chiral diols such as binaphthol (BINOL) have been prepared; the corresponding Rh complexes are excellent catalysts in the hydrogenation of prochiral olefins such as itaconic acid dimethyl ester or 2-acetamido methyl acrylate, the ee values being 90–99.5%.
已制备出具有非手性骨架的手性
配体,如连接两个从手性二元醇(如联
萘酚 (BINOL))中提取的
膦酸盐的
乙烯桥或
二茂铁桥;相应的 Rh 配合物在氢化手性烯烃(如
衣康酸二甲酯或
2-乙酰氨基丙烯酸甲酯)时是极好的催化剂,ee 值为 90-99.5%。