Derivation of saddle shaped cyclooctatetrathiophene: increasing conjugation and fabricating pentamer
作者:Yong Wang、Dewen Gao、Jianwu Shi、Yuhe Kan、Jinsheng Song、Chunli Li、Hua Wang
DOI:10.1016/j.tet.2013.12.002
日期:2014.1
With cyclooctatetrathiophene (COTh) as building block, two alpha,alpha,alpha,alpha-tetraaryl COThs, COThP and COThTh have been efficiently synthesized. Phenyl and thienyl were employed as end-capping groups to introduce to COTh and increase its conjugation. For enlarging the special 'saddle' shaped structure, a pentamer of COTh was synthesized via Negishi reaction and CuCl2-promoted oxidative coupling reaction. The pentamer (COThF) is a new type of dendrimer with COTh as dendron, which presents an artistic configuration possessing a large saddle shape. All compounds were fully characterized by H-1 NMR, C-13 NMR, HRMS and IR. The crystal structures of COThP and COThTh were confirmed by X-ray analysis. The molecular configuration of COThF was optimized by theoretical calculations. Their UV-vis properties, electrochemical behaviours and thermo-gravimetric analysis of COThP, COThTh and COThF were also described. (C) 2013 Elsevier Ltd. All rights reserved.
Palladium‐Catalyzed Synthesis of Heteroarene‐Fused Cyclooctatetraenes through Dehydrogenative Cyclodimerization
作者:Keita Fukuzumi、Yuji Nishii、Masahiro Miura
DOI:10.1002/anie.201707515
日期:2017.10.2
architectures. Considerable attention has been paid to the transition‐metal‐mediated synthesis of these cyclic compounds; however, there have been limited achievements to date in the efficient construction of heteroarene‐fused COTs. In this contribution, we report a novel Pd‐catalyzed dehydrogenative cyclodimerization of biheteroarenes through four‐fold C−H activation toward the synthesis of a series