A series of trialkylsilyl-substituted 2, 2′-dithiophene, 4, 4′-di-n-hexyl-2, 2′-dithiophene, 5, 5′-dithiazole, and 2, 2′-diselenophene with carbonyl (2a− d) and α-dicarbonyl bridges (3a− d) were prepared from readily available dihalides, using double lithiation followed by trapping with N, N-dimethylcarbamoyl chloride or diethyl oxalate (or N, N-dimethylpiperazine- 2, 3-dione), respectively. Cyclic voltammetry reveals that the first half-wave reduction ...
