Catalytic Mechanisms in Oxidative Carbonylation Reactions

Oxidative carbonylation represents a class of chemical transformations in which an organic substrate, carbon monoxide and an oxidant converge to form value-added carbonyl compounds such as esters and carbonates. Central to these processes is the ability of a metal centre—most often palladium—to cycle between distinct oxidation states, orchestrating bond-making and bond-breaking steps. The canonical cycle begins with substrate coordination and oxidative addition, proceeds through CO insertion to form a metal-acyl intermediate, and concludes with reductive elimination to liberate the carbonyl product while regenerating the lower-valent metal species. Reoxidation of the catalyst by molecular oxygen (or an alternative oxidant) closes the catalytic loop. Mechanistic understanding has been deepened by advances in operando spectroscopy and single-atom characterisation, revealing the influence of ligand design, support morphology and metal–oxygen interactions on activity, selectivity and stability. Both homogeneous and heterogeneous platforms have been elaborated, with heterogeneous systems often exploiting engineered supports—oxides bearing oxygen vacancies or nanostructured frameworks—to stabilise transient oxidation states and suppress metal leaching. These developments underpin increasingly sustainable syntheses of pharmaceutically relevant esters, diphenyl carbonate for polymer precursors and dimethyl carbonate as a green solvent or fuel additive.

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Catalytic Mechanisms in Oxidative Carbonylation Reactions publication trend

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Technical terms

Oxidative carbonylation: A reaction combining an organic substrate, carbon monoxide and an oxidant to form a carbonyl-containing product.

Oxidative addition: A step in which a metal centre increases its oxidation state by inserting into a chemical bond of the substrate.

Reductive elimination: A process where two ligands on a metal centre couple, releasing the product and reducing the metal’s oxidation state.

Oxygen vacancy: A defect site on a metal oxide support where an oxygen atom is absent, influencing adsorption and redox properties.

Heterogeneous catalysis: Catalysis in which reactants and catalyst reside in different phases, typically solid catalyst and gaseous or liquid reactants.

Homogeneous catalysis: Catalysis in which catalyst and reactants are in the same phase, often a uniform solution.

References

1. Pd catalyst supported on CeO 2 nanotubes with enhanced structural stability toward oxidative carbonylation of phenol. RSC Advances (2019).