Syntheses and Crystal Structures of Fused Thiophenes: [7]Helicene and Double Helicene, a D<sub>2</sub>-Symmetric Dimer of 3,3′-Bis(dithieno[2,3-<i>b</i>:3′,2′-<i>d</i>]thiophene)
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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.
创建时间：
2009-01-02
