化学
双功能
催化作用
硫脲
选择性
溴化铵
双功能催化剂
有机化学
无机化学
组合化学
生物化学
肺表面活性物质
作者
Tongfeng Dong,Yu‐Jia Zheng,Guan‐Wen Yang,Yao‐Yao Zhang,Bo Li,Guang‐Peng Wu
出处
期刊:Chemsuschem
[Wiley]
日期:2020-07-30
卷期号:13 (16): 4121-4127
被引量:30
标识
DOI:10.1002/cssc.202001117
摘要
Abstract The development of solvent‐free, metal‐free, recyclable organic catalysts is required for the current chemical fixation of carbon dioxide converted into cyclic carbonates. With the goal of reducing the cost, time, and energy consumption for the coupling reaction of CO 2 and epoxides, a series of highly active heterogeneous catalysts, based on a thiourea and quaternary ammonium salt system, are synthesized by using a thiol‐ene click reaction under ultraviolet light. Benefitting from synergistic interactions of the electrophilic center (thiourea) and the nucleophilic site (ammonium bromide), the catalysts exhibit excellent catalytic selectivity (99 %) for the cycloaddition of carbon dioxide with a diverse range of epoxides under mild conditions (1.2 MPa, 100 °C). Moreover, the catalyst can be easily recycled by facile filtration and reused for 5 times without noticeable loss of activity and selectivity. This work provides a potential heterogeneous catalyst for the conversion of carbon dioxide into high value‐added chemicals with the combined advantages of low cost, easy recovery, and satisfactory catalytic properties.
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