Simple preparation of terthiophene-3′-carboxylic acid and characterization of its polymer

5,2′-5′,2″-Terthiophene-3′-carboxylic acid (TTCA), a potentially useful starting material for the synthesis of functionalized polyterthiophenes, can be simply prepared by the treatment of 3′-bromothiophene with CuCN in DMF followed by hydrolysis in KOH-et