Efficient Synthesis of Trimethylsilyl-Substituted Dithieno[2,3-b:3′,2′-d]thiophene, Tetra[2,3-thienylene] and Hexa[2,3-thienylene] from Substituted [3,3′]Bithiophenyl

Efficient synthetic procedures for the preparation of b-trithiophenes (dithieno[2,3-b:3′,2′-d]thiophene) and two macrocyclic compounds, tetra[2,3-thienylene] and hexa[2,3-thienylene] bearing trimethylsilyl (TMS) groups from 2,2′-dibromo-5,5′-bistrimethylsilanyl[3,3′]bithiophenyl are reported. The UV-Vis spectra property and crystal structures of these macrocyclic oligo­thiophenes are described.