either a 2-(η5-cyclopentadienyl)(η4-tetraphenylcyclobutadiene)cobalt or a 2-(1,2,3,4,5-pentaphenyl)-ferrocene substituent. The influence of the bulky metallocenes result in these ligands mimicking planar chirality, as demonstrated by their catalysis of the addition of diethylzinc to benzaldehyde resulting in (R)-1-phenylpropanol (75% e.e.).
(小号) -
丝氨酸甲酯易于转化到含有2-(4-η(羟甲基)
恶唑啉配位体5 -
环戊二烯基)(η 4 -tetraphenylcyclobutadiene)
钴或2-(1,2,3,4,5- -五苯基)-
二茂铁取代基。庞大的茂
金属的影响导致这些
配体模仿了平面手性,如它们催化向
苯甲醛中添加
二乙基锌催化生成(R)-1-苯基
丙醇(75%ee)所证明的。