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 - Wang, Yangguang; Wang, Zhihua; Zhao, Dongfeng; Wang, Zhen; Cheng, Yangxiang; Wang, Hua (Synlett, 2007)