Bisphosphines for asymmetric hydrogenation catalysts
AssigneeBayer Aktiengesellschaft
InventorsChristian Laue, Georg Schroder, Dieter Arlt, Rolf Grosser
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Abstract
The invention relates to novel enantiomerically pure bisphosphines of the general formula (I) ##STR1## in which R, R.sup.1 and R.sup.2 have the meanings given in the description, a process for the preparation thereof and the use thereof in metal complexes as catalysts for asymmetric hydrogenations.
Claims14
An enantiomerically pure bisphosphine of the formula ##STR12## in which R is hydrogen or alkyl having from 1 to 4 carbon atoms,
- R.sup.1 is hydrogen and
- R.sup.2 is chlorine, or
- R.sup.1 and R.sup.2 together form the radical of the formula ##STR13## in their (R)- or (S)-form.
A compound of the formula ##STR20## in which R is hydrogen or alkyl having from 1 to 4 carbon atoms,
- R.sup.1 is hydrogen and
- R.sup.2 is chlorine, or
- R.sup.1 and R.sup.2 together form the radical of the formula ##STR21##
A compound of the formula ##STR22## in which R is hydrogen or alkyl having from 1 to 4 carbon atoms,
- R.sup.1 is hydrogen and
- R.sup.2 is chlorine, or
- R.sup.1 and R.sup.2 together form the radical of the formula ##STR23##
Dependencies are inferred from the claim text.