Journal
GREEN CHEMISTRY
Volume 19, Issue 16, Pages 3908-3915Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7gc01458a
Keywords
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Funding
- 973 Program [2015CB856600]
- NSFC [21502053, 21472049]
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We report the activation of (salen)CoI complex 3g by a phosphorane to form a bifunctional catalyst for the reaction of carbon dioxide with terminal epoxides or aziridines at ambient temperature and 1 bar carbon dioxide pressure. Only 1.0 mol% of both (salen) CoI 3g and phosphorane 4d are required for cyclic carbonate synthesis, and the catalyst loading could even be lowered down to 0.1 mol%. Under these conditions, no polycarbonate formation is detected by NMR analysis. It is proposed that the high efficiency originates from the activation of (salen) CoI by a phosphorane to form a phosphorane-salen Co(III) complex with enhanced Lewis acidity for the electrophilic activation while generating an iodide anion as a Lewis base co-catalyst to facilitate the ring-opening of epoxides. Further investigation revealed that the phosphorane-(salen)CoI complex could also successfully catalyze the coupling of CO2 with aziridines under ambient conditions at a catalyst loading of 2.5 mol%.
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