A class of atropisomeric diphosphine ligands with a wide range of dihedral angles has been developed. X-ray study of the Pd(II) complexes of these ligands showed that as the bridge length increased, the dihedral angles and the ligand bite angles increased as well, while an excessive increase in bridge length had a reverse effect. It was found that there was a correlation between the ligand dihedral
已经开发出具有广泛的二面角范围的一类阻转异构二
膦配体。这些
配体的Pd(II)配合物的X射线研究表明,随着桥长度的增加,二面角和
配体咬合角也随之增加,而桥长度的过度增加具有相反的作用。发现在Pd催化的α-邻苯二甲
酰亚胺酮的不对称氢化中,
配体二面角与对映选择性之间存在相关性,并提供了高达99%ee的优良对映选择性。