| abstract |
Process for the dimerization of a conjugated diene in the presence of a catalyst containing zerovalent nickel and a phosphorus compound. The catalyst is obtained by bringing together (A) at least one nickel complex of formula NiZq in which a is the degree of coordination of nickel and Z is at least one ligand capable of complexing nickel and (B) at least one phosphorus ligand of general formula <IMG> in which: - R1 is chosen from the hydrogen atom and the hydrocarbon radicals, - R2 and R3 are chosen from the hydrogen atom and the hydrocarbon radicals optionally carrying at least a function chosen from alcohol, thiol, thioether, amine, imine, acid, ester, amide and ether functions, and - m is greater than or equal to 1. |