| abstract |
The invention relates to a catalytic composition comprising: at least one oxidation state (+ II) nickel precursor, at least one phosphine ligand of formula PR1 R2R3 in which the groups R1, R2 and R3, which are identical or different from each other, linked or not, and at least one Lewis base, said composition having a molar ratio of the phosphine ligand to the nickel precursor of less than or equal to 5 and a molar ratio of the Lewis base group and phosphine ligand to the precursor nickel greater than or equal to 5. |