Syntheses and Crystal Structures of Fused Thiophenes: [7]Helicene and Double Helicene, a D2-Symmetric Dimer of 3,3′-Bis(dithieno[2,3-b:3′,2′-d]thiophene)
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- 作者：Chunli Li ; Jianwu Shi ; Li Xu ; Yangguang Wang ; Yanxiang Cheng ; Hua Wang
- 刊名：Journal of Organic Chemistry
- 出版年：2009
- 出版时间：January 2, 2009
- 年：2009
- 卷：74
- 期：1
- 页码：408-411
- 全文大小：244K
- 年卷期：v.74,no.1(January 2, 2009)
- ISSN：1520-6904
文摘
The efficient synthesis of (TMS)2-[7]helicene (rac-3) and double helicene, a D2-symmetric dimer of 3,3′-bis(dithieno[2,3-b:3′,2′-d]thiophene) (rac-4) was developed. The crystal structures of 3 and 4 show both strong intermolecular π-π interactions and S···S interactions. UV/vis spectra reveal that both 3 and 4 show significant π-electron delocalization.