S-Tetrazine-functionalized hyper-crosslinked polymers for efficient photocatalytic synthesis of benzimidazoles. Issue 3 (26th January 2021)

• Record Type: Journal Article
• Authors: An, Wan-Kai; Zheng, Shi-Jia; Zhang, Hui-Xing; Shang, Tian-Tian; Wang, He-Rui; Xu, Xiao-Jing; Jin, Qiu; Qin, Yuchen; Ren, Yunlai; Jiang, Song; Xu, Cui-Lian; Hou, Mao-Song; Pan, Zhenliang
• Is Part Of: Green chemistry. Volume 23:Issue 3(2021)
• Page Start: 1292
• Page End: 1299
• Publication Date: 2021-01-26
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/d0gc03719b
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : Constructing s -tetrazine-embedded HCP photocatalysts for the green synthesis of benzimidazoles. Abstract : Developing green-safe, efficient and recyclable catalysts is crucial for the chemical industry. So far, organic photocatalysis has been proved to be an environmentally friendly and energy-efficient synthetic technology compared with traditional metal catalysis. As a versatile catalytic platform, hyper-crosslinked polymers (HCPs) with large surface area and high stability are easily prepared. In this report, we successfully constructed two porous HCP photocatalysts (TZ-HCPs) featuring s -tetrazine units and surface areas larger than 700 m 2 g −1 through Friedel–Crafts alkylation reactions. The rational energy-band structures and coexisting micro- and mesopores endow TZ-HCPs with excellent activities to realize the green synthesis of benzimidazoles (28 examples, up to 99% yield, 0.5–4.0 h) in ethanol. Furthermore, at least 21 iterative catalytic runs mediated by TZ-HCP1D were performed efficiently, with 96–99% yield. This study of TZ-HCPs sheds light on the wide-ranging prospects of application of HCPs as metal-free and green photocatalysts for the preparation of fine chemicals.