Thiophene/selenophene-based S-shaped double helicenes: regioselective synthesis and structures

• Mengjie Wang,
• Lanping Dang,
• Wan Xu,
• Zhiying Ma,
• Liuliu Shao,
• Guangxia Wang,
• Chunli Li and
• Hua Wang

Beilstein J. Org. Chem. 2022, 18, 809–817, doi:10.3762/bjoc.18.81

• packing structures of these compounds. Spectroscopic results and our previous work showed that the combination of molecular structure change and heteroatom replacement from S to Se could precisely modulate molecular energy levels. Keywords: crystal structure; double helicene; regioselective synthesis

• (trimethylsilanyl)diseleno[3,2-b:2′,3′-d]selenophene ((TMS)2-tt-DSS) and (TMS)2-bb-DSS, respectively. In this work, the novel S-shaped double helicene DH-3 (Figure 1), which is based on selenophene units, was constructed as a new member of the selenohelicene family (Figure 1). In this synthetic study

• oxidative photocyclizations of 5a is consistent with the experimental result, that is, an S-shaped double helicene can be selectively obtained through the double oxidative photocyclization of compound 5a. Crystallographic analyses of DH-1 and DH-2 The molecular structures of DH-1 and DH-2 were confirmed by