An iterative strategy for the synthesis of oligothiophenes by catalytic cross-coupling reactions

An iterative strategy for the synthesis of new sulfur-functionalized oligothiophenes by Suzuki or Stille cross-coupling reactions was applied to the reaction of 4-bromo-tert-butylphenylthioether with thiophene derivatives. The planarity of the oligothiophenes obtained was confirmed by the single-crystal X-ray structure analysis of 2-(4-tert-butylthiophenyl)thiophene, which shows a potentially large electronic conjugation length.