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Activation of (salen)CoI complex by phosphorane for carbon dioxide transformation at ambient temperature and pressureElectronic supplementary information (ESI) available. See DOI: 10.1039/c7gc01458a
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...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | 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 CO
2
with aziridines under ambient conditions at a catalyst loading of 2.5 mol%.
The activation of a (salen)CoI complex by phosphorane
in situ
formed a bifunctional catalyst for the reaction of carbon dioxide with terminal epoxides or aziridines at ambient temperature and 1 bar carbon dioxide pressure. |
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| ISSN: | 1463-9262 1463-9270 |
| DOI: | 10.1039/c7gc01458a |