催化作用
化学
亲核细胞
溴化物
离子液体
环加成
介孔材料
选择性
路易斯酸
协同催化
组合化学
无机化学
有机化学
作者
Kwangsun Yu,Pillaiyar Puthiaraj,Wha‐Seung Ahn
标识
DOI:10.1016/j.apcatb.2020.119059
摘要
The direct synthesis of cyclic carbonates from olefins involves epoxidation and CO2 cycloaddition reactions in series. It is, however, a challenging task to devise single catalyst with the multiple functions for one-pot reaction. Herein, an imidazolium bromide ionic liquid-functionalized metalloporphyrin ImBr-MOF-545(Mn) was proposed as an effective catalyst for the reaction. The effects of temperature, pressure, catalyst loading, and time were examined for individual reactions and finally for one-pot reaction. ImBr-MOF-545(Mn) was efficient under solvent-free condition of 60 °C, 5/5 bar (O2/CO2), and 10 h. The Mn(III) ions with the dual functions of oxidation and acting as Lewis acid catalyst with strong nucleophilic/leaving bromide anion in an adjacent position of mesoporous MOF-545 resulted in high efficiency and selectivity to the cyclic carbonates. The catalyst also showed sufficient stability for up to 5 runs with little decline in catalytic activity. A radical mechanism for the epoxidation step and a plausible reaction pathway was proposed.
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