Synthesis of substituted oligothiophenes and X-ray crystal structures of3′-methyl-2,2′∶5′,2″-terthiophene,3,3″-dimethyl-2,2′∶5′,2″-terthiophene and5′-(2-thienyl)-2,2′∶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.

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