METAL COMPLEXES

摘要

Compounds of the formulae (I) and (Ia) where X₁ is secondary phosphino; R₃ is a hydrocarbon radical having from 1 to 20 C atoms, a heterohydrocarbon radical which has from 2 to 20 atoms and at least one heteroatorn selected from the group consisting of O, S, NH and NR, or an -SO₂-R radical; R is C₁-C₁₈-alkyl, phenyl or benzyl; the radicals R₄ are each, or the two radicals R4 together a hydrocarbon radical having from 1 to 20 C atoms; R₀₁ is a hydrocarbon radical having from 1 to 20 C atoms; and R₀₂ and R'_o2 are each, independently of one another, a hydrogen atom or independently have the meaning of R₀₁, or R₀₁ and R₀₂ together with the C atom to which they are bound form a three- to eight-membered hydrocarbon or hetero hydrocarbon ring. The compounds are chiral ligands for complexes of metals of transition groups I and VIII which act as catalysts for asymmetric additions, for example of hydrogen, onto prochiral unsaturated organic compounds.