Patent ID: 8008529

Claim:
A compound of the formula I having at least two chiral centres in the form of mixtures of diastereomers or pure diastereomers secondary phosphine-Q-P*(═O)HR 1 (I), in which secondary phosphine is a secondary phosphine group with hydrocarbon radicals or heterohydrocarbon radicals as substituents; Q is a bivalent bisaryl or bisheteroaryl radical with an axial chiral centre to which the two phosphorus atoms are bonded in the ortho positions to the bisaryl or bisheteroaryl bridge bond, or Q is a bivalent ferrocenyl radical with a planar chiral centre, or Q is a bivalent ferrocenyl radical without a planar chiral centre, to which the phosphorus atom of the secondary phosphine is bonded directly or via a C 1 -C 4 -carbon chain to a cyclopentadienyl ring, the —P*(═O)HR 1 group is bonded either on the same cyclopentadienyl ring in ortho position to the bonded secondary phosphine or on the other cyclopentadienyl ring; P* is a chiral phosphorus atom, and R 1 is a hydrocarbon radical, a heterohydrocarbon radical or a ferrocenyl radical, where R 1 is a ferrocenyl radical with a planar chiral centre when Q as a bivalent ferrocenyl radical does not have a planar chiral centre.