Patent ID: 6075161
Filing Date: 2000-06-13
Classification: C07C

Abstract:
A process for preparing 3-pentenoic esters by carbonylation of alkoxybutenes in the presence of a catalyst and a solvent at elevated temperature and elevated pressure, which comprises reacting at least one C.sub.1 -C.sub.10 -alkoxybutene in which the alkoxy group is in the allyl position relative to the double bond with carbon monoxide at a temperature in the range from 60 to 140.degree. C. and a carbon monoxide partial pressure in the range from 3 to 30 MPa in the presence of a catalyst based on palladium,wherein the carbonylation is carried out in the additional presence of an additive which increases the activity and/or stability of the palladium catalyst selected from the group consisting of chlorides, inorganic acids, and Lewis acids at a molar ratio of additive to catalyst of from 0.1 to 10 wherein the molar ratio of catalyst to alkoxybutene is from 0.1:1 to 10:1 and wherein the process yields essentially no 4-pentenoic ester and less than 2% of 2-pentenoic ester based on the respective 3-pentenoic ester.