摘要 |
Compounds of the formulae (I) and (Ia) where X<SUB>1 </SUB>is secondary phosphino; R<SUB>3 </SUB>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 -SO<SUB>2</SUB>-R radical; R is C<SUB>1</SUB>-C<SUB>18</SUB>-alkyl, phenyl or benzyl; the radicals R<SUB>4 </SUB>are each, or the two radicals R4 together a hydrocarbon radical having from 1 to 20 C atoms; R<SUB>01 </SUB>is a hydrocarbon radical having from 1 to 20 C atoms; and R<SUB>02 </SUB>and R'<SUB>o2 </SUB>are each, independently of one another, a hydrogen atom or independently have the meaning of R<SUB>01</SUB>, or R<SUB>01 </SUB>and R<SUB>02 </SUB>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. |