Abstract
CO2 undergoes cycloaddition to propyne on a cationic rhodium site with the assistance of O2−/OH− of support or iron oxide over Rh4 and Fex Rhy carbonyl clusterderived catalysts.13CO12 labeling and FTIR studies suggest that monodentate carbonate formed on the catalyst surface is most likely a key species to offer an active CO2 to be converted into a carbonyl intermediate prior to the product 4,6-dimethyl-2-pyrone.
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