Benzothiophene- and benzoselenophene-fused azulene derivatives were synthesized by Cu-catalyzed tandem cyclization via the Ullmann-type S/Se– arylation and Csp2–H chalcogenation of 2-(2′-bromophenyl)azulene. The maximum absorption of tetracyclic products was red-shifted from that of 2-phenylazulene, which does not contain a bridged chalcogen atom. Single-crystal X-ray analysis of azuleno[1,2-b]benzoselenophene revealed that the benzo[b]selenophene and azulene rings are almost coplanar.

中文翻译：

---

Azuleno[1,2-的合成及光学性质

苯并噻吩和苯并硒吩稠合的薁衍生物通过 Cu 催化的串联环化通过 Ullmann 型 S/Se- 芳基化和2-(2'-溴苯基) 薁的Csp 2 -H 硫族化合成。四环产物的最大吸收比不包含桥接硫族原子的 2-苯基薁红移。azuleno[1,2- b ]benzoselenophene的单晶 X 射线分析表明，benzo[ b ]selenophene 和azulene 环几乎是共面的。