| abstract |
The present invention relates to carbonylation with carbon monoxide of allyl butenols and / or their carboxylic esters.n n n More precisely, it consists in reacting carbon monoxide with at least one of said allylic butenols and carboxylic esters, at elevated temperature, under a pressure higher than atmospheric pressure and in the presence of an iridium catalyst and of a promoter. iodinated or brominated, the promoter / iridium molar ratio being between 0.1 / 1 and 20/1.n n n This process makes it possible to prepare pentenoic acids, in particular 3-pentenoic acid, which can itself be hydroxycarbonylated by carbon monoxide and water to adipic acid. |