Preparation of 3,4-difluorobenzoic acid by the...

Details Preparation of 3,4-difluorobenzoic acid by the... Preparation of 3,4-difluorobenzoic acid by the...

C - Chemistry, Metallurgy

07

C

260/513.5

C07C 51/38 (2006.01) C07C 63/70 (2006.01)

Patent

CA 2016657

ABSTRACT OF THE INVENTION PREPARATION OF 3.4-DIFLUOROBENZOIC ACTD BY THE DECARBOXYLATION OF 4,5-DIFLUOROPHTHALIC ANHYDBIDE OR 4,5-DIFLUOROPHTHALIC ACID 4,5-Difluorophthalic anhydride and 4,5-difluorophthalic acid may be decarboxylated in high yield to 3,4-difluorobenzoic acid by heating in N-methyl-2-pyrrolidone or dimethyl acetamide using copper, copper oxide, copper salts, or halides and salts of Zn, Cd, Ag and Ni as a catalyst.

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