Patent ID: 7659411

Claim:
A process for producing a 2-acylthiophene compound comprising reacting a thiophene compound represented by formula (1): wherein R 1 is a hydrogen atom, a C 1-6 alkyl group, a phenyl group, or a halogen atom, with at least one member selected from the group consisting of acid anhydrides represented by formula (2): wherein R 2 is a C 1-6 alkyl group or a phenyl group, and acid halides represented by formula (3): wherein R 2 is defined above and X is a halogen atom, in the presence of a cation exchange resin at a temperature of 10° C. to 60° C. in the absence of solvent, thus producing a 2-acylthiophene compound represented by formula (4): wherein R 1 and R 2 are as defined above.