PROCESSES FOR THE PREPARATION OF A CAROBXYLIC ANHYDRIDE AND USE OF THE CARBOXYLIC ANHYDRIDE AS AN ACYLATION AGENT

摘要

Process for the preparation of an carboxylic anhydride by reaction of an ethylenically unsaturated compound with carbon monoxide and an carboxylic ac id in the presence of a catalyst comprising: a) a source of a group VIII metal, b) a bidentate diphosphine of formula (I), wherein R1~ represents a bivalent radical that together with the phosphorus atom to which it is attached is an optionally substituted 2-phospha-tricyclo [3.3.1.1{3,7}]-decyl group or a derivative thereof in which one or more of the carbon atoms are replaced by heteroatoms ("2-PA" group); wherein R2~ and R3~ independently represent univalent radicals of up to 20 atoms or jointly form a bivalent radical of u p to 20 atoms; wherein R represents a bivalent organic bridging group; and c) a complexing anion; wherein the complexing anion is the anion of the carboxyli c acid. Process wherein the carboxylic acid is prepared in-situ and use of the carboxylic anhydride as an acylation agent.