The invention relates to the preparation and use as catalysts of diphosphines of the formula (I)
1
in which
R is C
6
-C
14
-aryl or C
4
-C
13
-heteroaryl containing 1 to 3 heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, wherein the aryl and heteroaryl radicals may optionally be substituted by halogen, C
1
-C
6
-alkyl, C
1
-C
6
-alkoxy, and/or trimethylsilyl, and
R
1
to R
4
, independently of one another, are each hydrogen, C
1
-C
10
-alkyl, C
1
-C
10
-alkoxy, F, Cl, or Br.
该发明涉及配方(I)中的
二膦化合物的制备和用作催化剂,其中R为C6-C14-芳基或C4-C13-杂芳基,包含1至3个从氮、氧和
硫组成的杂原子,其中芳基和杂芳基基团可以选择性地被卤素、C1-C6-烷基、C1-C6-烷氧基和/或三甲基
硅基取代,而R1至R4,彼此独立,分别为氢、C1-C10-烷基、C1-C10-烷氧基、F、Cl或Br。