废止
亚胺
化学
共价键
铑
激进的
苯并咪唑
喹啉
组合化学
催化作用
有机化学
作者
Xiaodong Zhao,Huaji Pang,Dekang Huang,Gang Liu,Jianxiang Hu,Yonggang Xiang
标识
DOI:10.1002/ange.202208833
摘要
Abstract Exploring new routes to lock the dynamic C=N bonds in imine‐linked covalent organic frameworks (COFs) is highly desired for enhancing their stability and functionality. Herein, a novel C=N bridge locking strategy via rhodium‐catalyzed [4+2] annulation is developed to construct nonsubstituted quinoline‐linked COFs (NQ‐COFs). The notable feature of this strategy includes high C=N conversion efficiency, oxidant‐free, and generality for synthesis of a variety of NQ‐COFs with high chemical stability. Particularly, after post‐synthetic modification, the crystallinity, topology, and porosity of pristine imine‐linked COFs are well retained. When used as photocatalysts, NQ‐COFs display better visible light absorption and carriers’ separation efficiency due to enhanced in‐plane π conjugation ability, as well as more facile generation of superoxide anion radicals than their counterparts, thus leading to efficient synthesis of 2,4,6‐tris(aryl)pyridines, benzimidazole, and sulfoxide derivatives.
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