Diphosphines and process for their preparation

Details Diphosphines and process for their preparation Diphosphines and process for their preparation

1995-09-27

1997-12-09

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus containing

568 16, C07F 950

Patent

active

056962967

ABSTRACT:
A diphosphine of the formula (I) ##STR1## in which Ar--Ar is a biphenyl radical, a 1-phenyl-naphthyl radical or a 1,1'-binaphthyl radical, the CH.sub.2 groups am each located in the ortho-position relative to the Ar--Ar bond, R is F or an alkyl radical or alkoxy radical having in each case 1 to 8 carbon atoms, n is an integer from 0 to 4, the radicals PR.sup.1 R.sup.2 and PR.sup.3 R.sup.4 differ from one another, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another are each an alkyl radical having 1 to 10 carbon atoms, a cycloaliphatic radical having 5 to 10 carbon atoms, or a radical Ar.sup.1 --(R.sup.5).sub.m, in which AR.sup.1 is a phenyl radical, R.sup.5 is F, CF.sub.3, or an alkyl radical having 1 to 4 carbon atoms and m is 0 to 1, or R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another and including the particular P atom to which they are bonded, form a ring having 4 to 8 members, onto which one or two aromatic rings or ring systems containing 6 to 10 carbon atoms are optionally fused. The invention furthermore relates to a process for the preparation of these diphosphines.

REFERENCES:
patent: 4755624 (1988-07-01), Phillips et al.
patent: 4879416 (1989-11-01), Puckette et al.
patent: 5481045 (1996-01-01), Bahrmann et al.
CAS 117:150499 (1992).

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