| 초록 |
The direct synthesis of cyclic carbonates from olefins involves epoxidation and CO2 cycloaddition reactions in series. 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 the one-pot reaction. ImBr-MOF-545(Mn) was efficient under 60 °C, 5/5 bar (O2/CO2), 10 h, and solvent-free conditions. 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 plausible reaction pathway for the one-pot reaction was proposed. |
