C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/536.5
C07C 53/12 (2006.01) C07C 51/56 (2006.01)
Patent
CA 1225659
A B S T R A C T PROCESS FOR THE PREPARATION OF CARBOXYLIC ANHYDRIDES Process for the preparation of a carboxylic anhydride by reacting under virtually water-free conditions an ester having the formula R1COOCH2R2 or an ether having the formula R3OR4 in which R1, R3 and R4 represent substituted or non-substituted hydrocarbon groups and R2 represents hydrogen or a substituted or non-substituted hydrocarbon group with carbon monoxide in the presence of a nickel catalyst, an iodide and/or bromide source and at least one co-promoter, characterized in that the reaction is carried out in the presence of a compound having the formula Image I in which X represents phosphorus, arsenic or antimony and Y oxygen, sulphur or selenium and a and b are 0 or 1 and R5 represents hydrogen or a substituted or non-substituted hyro- carbon group and R6 and R7 represent a substituted or non- substituted hydrocarbon group, or a and b are 0 and R6 and R7 form a heterocyclic group with X and R5 represents hydrogen or a substituted or non-substituted hydrocarbon group, or in the presence of a complex of a compound having the formula I with a hydrocarbon iodide or bromide, an acyl iodide or bromide or HI or HBr. BMRH04/MF
442347
Shell Canada Limited
Smart & Biggar
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