Process for preparing beta,gamma unsaturated carboxylic acids.

摘要

Process for the preparation of beta , gamma -unsaturated acids by carbonylation of allyl alcohols.
<??>The process comprises bringing into contact an allyl alcohol, carbon monoxide and a palladium-based catalyst at elevated temperature and at a pressure above atmospheric pressure. It is characterised in that the operation is also carried out in the presence of at least one quaternary onium chloride of a group VB element chosen from nitrogen and phosphorus, the said element being tetracoordinated to carbon atoms, it being possible for the nitrogen to be coordinated to two pentavalent phosphorus atoms.
<??>The process is particularly suited for the preparation of 3-hexene-1,6-dioic acid from butenediols.