Thiophene-3,4-dicarboxylic acid → 1H,3H-Thieno[3,4-c]furan-1,3-dione

Participants

Reaction Steps

A solution of thiophene-3,4-dicarboxylic acid (0.90 g, 5.23 mmol) in acetic anhydride (21 mL) was stirred overnight at 140° C. The reaction mixture was subsequently concentrated to yield thiophene-3,4-dicarboxylic anhydride as a brown solid which was used without further purification.

Provenance & Evidence