... Synthesis of substituted oligothiophenes and X-ray crystal structures of 3 -methyl-2,2 :5 ,2 -terthiophene, 3,3 -dimethyl-2,2 :5 ,2 - terthiophene and 5 -(2-thienyl)-2,2 :3 ,2 -terthiophene Penny A. Chaloner,* Sumudu R. Gunatunga and Peter B. Hitchcock School of Chemistry, Physics and Environmental Science, University of Sussex, Falmer, Brighton, UK BN1 9QJ A range of substituted oligothiophenes has been prepared and characterised. ...