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Dalton Trans. 2016 Jun 28;45(26):10577-84. doi: 10.1039/c6dt01746k.

Carboxylation of terminal alkynes with CO2 using novel silver N-heterocyclic carbene complexes.

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School of Chemistry and Materials Science, Liaoning Shihua University, Dandong Road 1, Fushun 113001, P. R. China.
Fushun Research Institute of Petroleum and Petrochemicals, Sinopec Group, Fushun 113001, P. R. China.


Four novel N-heterocyclic carbene (NHC) silver complexes, , have been synthesized and characterized. The single X-ray crystal diffraction data indicate a dinuclear solid-state structure for and and a mononuclear structure for and . These complexes have been successfully used as efficient catalysts for the C-H activating carboxylation of terminal alkynes with CO2. A wide range of substrates with various functional groups afforded the corresponding aryl or alkyl substituted propiolic acids in good yields under mild conditions. Moreover, the role of bases and the reaction mechanism is thoroughly discussed.


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