Compounds of the formula I, in the form of mixtures comprising predominantly one enantiomer or in the form of pure enantiomers, secondary phosphine-Q-P*(═O)HR
1
(I) in which secondary phosphine is a C-bonded, secondary phosphine group —P(R)
2
; in which R is in each case independently hydrocarbon radicals or heterohydrocarbon radicals; Q is a bivalent, achiral, aromatic base skeleton, a bivalent, achiral ferrocene base skeleton, an optionally substituted bivalent cycloalkane or heterocycloalkane skeleton, or a C1-C4-alkylene skeleton, and in which base skeletons a secondary phosphine group is bonded directly to a carbon atom, or, in the case of cyclic base skeletons, directly to a carbon atom or via a C
1
-C
4
-alkylene group, and in which base skeletons a P-chiral group —P*(O)HR
1
is bonded to a carbon atom such that the phosphorus atoms are linked via 1 to 7 atoms of a carbon chain optionally interrupted by heteroatoms from the group of O, S, N, Fe or Si; P* is a chiral phosphorus atom; and R
1
is a hydrocarbon radical, a C-bonded heterohydrocarbon radical or a ferrocenyl radical, with the proviso that R
1
is an achiral ferrocenyl radical when Q is an achiral ferrocenyl base skeleton. Metal complexes of these ligands in a molar ratio of ligand to metal of about 1.3:1 to 0.9:1 are homogeneous catalysts for asymmetric addition reactions, particularly hydrogenations.
化合物I的公式,以主要由一对映异体组成的混合物形式或纯映异体形式存在,其中二级膦-Q-P*(═O)HR1(I),其中二级膦是C-键合的二级膦基团-P(R)2;其中R在每种情况下独立地是碳氢基团或杂环碳氢基团;Q是二价的、无手性的、芳香基骨架、二价的、无手性的
二茂铁基骨架、可选取代的二价环烷基或杂环烷基骨架,或C1-C4-烷基骨架,在这些基骨架中,一个二级膦基团直接键合到碳原子上,或在环状基骨架的情况下,直接键合到碳原子或通过C1-C4-烷基骨架,且在这些基骨架中,一个P-手性基团-P*(O)HR1键合到碳原子,使得
磷原子通过1到7个碳链原子(可选取自O、S、N、Fe或Si的杂原子组)连接;P*是一个手性
磷原子;R1是一个碳氢基团、C-键合的杂环碳氢基团或
二茂铁基基团,但当Q是无手性
二茂铁基骨架时,R1是一个无手性
二茂铁基基团。这些
配体的
金属配合物在
配体与
金属的摩尔比约为1.3:1至0.9:1时,是不对称加成反应的均相催化剂,特别是氢化反应。