Halide aided synergistic ring opening mechanism of epoxides and their cycloaddition to CO2 using MCM-41-imidazolium bromide catalyst
作者： Farook Adam , Jimmy Nelson Appaturi , Eng-Poh Ng
DOI: 10.1016/J.MOLCATA.2014.02.008
关键词:
摘要: a b s t r c Imidazole was immobilized on MCM-41 using 3-chloropropyltriethoxysilane (CPTES) as the anchoring agent followed by alkylation with 1,2-dibromoethane at 110 ◦C. The resulting catalyst designated MCM-41-Imi/Br. used for synthesis of cyclic carbonates via cycloaddition CO2 several epoxides under solvent free condition. use MCM-41-Imi (without bromide ion) to catalyze reaction led elucidation mechanism involved in synergistic catalysis. styrene oxide, epichlorohydrine, glycidol, allyl glycidyl ether and phenyl ether. A high yield excellent selectivity were obtained optimized conditions. yields respective 98.8% 97.0% epichlorohydrin, 98.3% 97.5% ether, 96.7% 100% 1,2-epoxyhexane.
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