SEARCH Articles Figures Tables 1- thieno thiophene formation 3-Thiophen-carboxylic acid Carboxylate formation Carboxylates formation Carboxylic acids formation Thieno thiophene Thieno thiophene-2-carboxylates Thieno thiophene-2-carboxylates formation Thieno thiophene-2-carboxylic acid Thieno thiophenes formation Thiophene-2-carboxylic acids, acidity Thiophene-4-carboxylate Thiophene-carboxylic acids Thiophenes, formation