Process for the carbonylation of methanol or a reactive...

Details Process for the carbonylation of methanol or a reactive... Process for the carbonylation of methanol or a reactive...

C - Chemistry, Metallurgy

07

C

C07C 53/08 (2006.01) B01J 31/18 (2006.01) C07C 51/12 (2006.01) C07C 67/36 (2006.01) C07C 69/14 (2006.01) C07F 9/50 (2006.01) C07F 9/53 (2006.01) C07F 15/00 (2006.01)

Patent

CA 2126961

Abstract PROCESS FOR THE CARBONYLATION OF METHANOL OR A REACTIVE DERIVATIVE THEREOF A process for the liquid phase carbonylation of methanol or a reactive derivative thereof comprises contacting carbon monoxide with a liquid reaction composition comprising methanol or a reactive derivative thereof, a halogen promoter and a rhodium catalyst system comprising a rhodium component and a bidentate phosphorus-sulphur ligand, the ligand comprising a phosphorus dative centre linked to a sulphur dative or anionic centre by a substantially unreactive backbone structure comprising two connecting carbon atoms or a connecting carbon and a connecting phosphorus atom. Novel rhodium ligand complexes of formula [Rh(CO)L]m and [Rh(CO)LY] wherein Y is a halogen, m is a number less than 10 and L is : (II) Image (IV) Image (III) Image (V) Image wherein the R groups are independently selected from C1 to C20 alkyl, cycloalkyl, aryl, substituted aryl and optionally substituted aralkyl, the R5 groups are selected from hydrogen, C1 to C20 alkyl, cycloalkyl, aryl, substituted aryl, acyl and optionally substituted aralkyl groups; the R1 to R4 groups are independently selected from hydrogen, C1 to C20 alkyl and optionally substituted aralkyl; X is a non-coordinating substitutent such as C1 to C20 alkyl, cycloalkyl, aryl, substituted aryl, C1 to C20 alkoxy, C1 to C20 alkylthio, trialkylsilyl or triarylsilyl, preferably, Si(CH3)3 or methyl and n is 0 to 4 preferably 0 or 1.

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