| abstract |
The present invention relates to a system comprising a palladium or palladium compound and said diphosphine, suitable as carbonylation catalysts for the carbonylation of conjugated dienes and diphosphines of formula (1) and mixtures of such diphosphines. The invention also relates to a process for the carbonylation of conjugated dienes in the presence of such a system.n n n <Formula 1>n n n R 1 > P- (CH) n -PR 2 R 3 n n n Wheren n n R 1 is a divalent radical which, together with the linked phosphorus atom, forms an unsubstituted or substituted 2-phosphaticyclo [3.3.1.1 {3,7}] decyl group or derivative thereof in which one or more carbon atoms are replaced by a hetero atom ego,n n n R 2 and R 3 are each, independently of one another, a monovalent radical having 1 to 20 atoms, or together form a divalent radical having 2 to 20 atoms,n n n n is 4 or 5. |