Synthesis of new thieno[3,4-c]thiophene derivatives having formyl substituents
Abstract
The relatively stable new thieno[3,4-c]thiophene derivatives, 1-formyl-3,4,6-tris(isopropylthio)thieno[3,4-c]thiophene (3) and 1,6-diformyl-3,4-bis(isopropylthio)thieno[3,4-c]thiophene (4), have been prepared from 1,3,4,6-tetrakis(isopropylthio)thieno[3,4-c]thiophene (2) by substitution with the Vilsmeier reagent, and the structure of (4) has been determined by X-ray diffraction.