| abstract |
The present invention relates to a process for the preparation of diesters of 1,6-hexenedioic acid.n n n A more specific subject of the present invention is a process for the preparation of diesters of 1,6-hexene-1,6-dioic acid by reacting carbon monoxide and an alcohol on at least one butene disubstituted by acyloxy groups in the presence of '' a palladium-based catalyst, characterized in that the reaction is also carried out in the presence of a quaternary onium halide of an element of group VB chosen from nitrogen and phosphorus, said element being tetracoordinated to atoms carbon, nitrogen can be coordinated with two pentavalent phosphorus atoms, the halide anion being chosen from chloride and bromide. |