Updated
6 Sep 2010

Reduction of carbon dioxide to carbon monoxide using N-heterocyclic carbenes (NHCs)
Gu and Zhang have reported a catalytic reduction of carbon dioxide to carbon monoxide using NHCs as an organocatalysts with an accompanying oxidation of aromatic aldehydes. The reaction gave the best results when it was performed in DMSO with 1,3-bis(2,4,6-trimethylphenyl)imidazolinium chloride (SIMes.HCl) as an NHC, and potassium carbonate as an additive. They showed that the reaction mechanism involved the nucleophilic attack on the aldehyde by imidazolium carboxylate, which was formed by the reaction of NHC with carbon dioxide. The reaction provides a new method for utilizing carbon dioxide as a “green” renewable source.
L. Gu, Y. Zhang, J. Am. Chem. Soc. 2010, 132, 914.
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