Synthesis of substituted oligothiophenes and X-ray crystal structures of 3'-methyl-22' :5'2'' - terthiophene and 5'-(2-thienyl)-22' :3'2''-terthiophene

A range of substituted oligothiophenes has been prepared and characterised. Crystal structures were determined for three substituted terthiophenes. Both in solution and in the solid state, syn-conformers were found to be populated to a greater extent than expected.