Syntheses and Crystal Structures of Fused Thiophenes: [7]Helicene and Double Helicene, a D 2 -Symmetric Dimer of 3,3′-Bis(dithieno[2,3- b :3′,2′- d ]thiophene)
✍ Scribed by Li, Chunli; Shi, Jianwu; Xu, Li; Wang, Yangguang; Cheng, Yanxiang; Wang, Hua
- Book ID
- 126150854
- Publisher
- American Chemical Society
- Year
- 2009
- Tongue
- English
- Weight
- 483 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0022-3263
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An improved synthesis of dithieno[3,2-b:2%,3%-d]thiophene 1 is presented. By starting from 2,3-dibromothiophene 2 the total yield was improved from 35 to 58%. We also describe a more convenient synthesis of one of the reagents, benzenesulfonic acid thioanhydride 3.
The synthesis of the title compound (4), starting from commercial 3-bromo-4-methylthiophene, is described. The single crystal packing mode of 4, as well as the absorption and photoluminescence properties in solution and in the solid state are reported and analyzed in relation to those of the isomeri