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Issue 16, 2017
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Activation of (salen)CoI complex by phosphorane for carbon dioxide transformation at ambient temperature and pressure

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Abstract

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%.

Graphical abstract: Activation of (salen)CoI complex by phosphorane for carbon dioxide transformation at ambient temperature and pressure

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Publication details

The article was received on 16 May 2017, accepted on 22 Jul 2017 and first published on 24 Jul 2017


Article type: Paper
DOI: 10.1039/C7GC01458A
Citation: Green Chem., 2017,19, 3908-3915
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    Activation of (salen)CoI complex by phosphorane for carbon dioxide transformation at ambient temperature and pressure

    F. Zhou, S. Xie, X. Gao, R. Zhang, C. Wang, G. Yin and J. Zhou, Green Chem., 2017, 19, 3908
    DOI: 10.1039/C7GC01458A

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