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首页> 外文期刊>Catalysis science & technology >Photocatalytic green synthesis of benzazoles from alcohol oxidation/toluene sp(3) C-H activation over metal-free BCN: effect of crystallinity and N-B pair exposure
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Photocatalytic green synthesis of benzazoles from alcohol oxidation/toluene sp(3) C-H activation over metal-free BCN: effect of crystallinity and N-B pair exposure

机译：光催化的绿色合成benzazoles酒精氧化/甲苯sp(3)碳氢键活化不含金属的BCN:结晶度的影响nb副接触

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摘要

Porous borocarbonitride (P-BCN), with the characteristics of enhanced crystallinity and improved N-B pair exposure, was prepared with a simple KCl-assisted molten salt strategy. Efficient heterogeneous photocatalytic tandem synthesis of benzazoles from alcohol oxidation/toluene sp(3) C-H activation was achieved firstly over the metal-free P-BCN using visible light and the green oxidant O-2, with only water as a by-product. Various o-thio/hydroxy/aminoanilines and alcohols or toluenes could be converted to the corresponding 2-substituted benzothiazoles, benzoxazoles and benzimidazoles with good to excellent photocatalytic performance. The improved photocatalytic performance in comparison to bulk BCN should be due to the crystallinity-enhancement-induced improvement in charge separation and transmission. The increased N-B pair exposure promoted superoxide radical generation due to the electron-enriched N atoms, as well as improved oxidation ability due to the valence band constructed by the B 2p orbital. This work presents a green and efficient synthetic strategy towards benzazoles and other fine chemicals via metal-free heterogeneous photocatalysis.
机译：多孔borocarbonitride (P-BCN),提高结晶度和的特征提高nb对曝光,是有准备的简单KCl-assisted熔盐的策略。高效的多相光催化串联合成的benzazoles酒精氧化/甲苯sp(3)碳氢键活化在不含金属的实现首先P-BCN使用可见光和绿色氧化剂0 2,只有水作为一种副产品。o-thio /羟基/ aminoanilines和醇甲苯可以转化为相应的2-substituted苯并噻唑、苯并恶唑和苯并咪唑具有良好的优秀光催化性能。光催化性能相比,散装BCN应该由于crystallinity-enhancement-induced改善电荷分离和传输。nb副接触提升超氧化物自由基一代由于electron-enriched N个原子,以及改善由于氧化能力价带由B 2 p轨道。这项工作提出了一种绿色、高效的对benzazoles和其他合成策略通过不含金属的异构精细化学品光催化作用。

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