Oxidation with the "O2 - H2O2 - Vanadium complex-pyrazine-2-carboxylic acid" reagent 11. Oxidation of styrene, phenylacetylene, and their derivatives with the formation of benzaldehyde and benzoic acid

Article abstract of DOI:10.1007/BF02494631

The vanadium complex - pyrazine-2-carboxylic acid (PCA) system catalyzes oxidation of styrenes PhRC=CHR′ (R = H, Me; R′ = H, Ph) or phenylacetylenes PhC=CR (R = H, Ph) with hydrogen peroxide in air to give aldehydes, ketones, and carboxylic acids. The reaction begins with H₂O₂ coordination to the vanadium ion followed by the formation of hydroxyl radicals. Catalytic action of PCA facilitates the reduction of the V^V complex to the V^IV complex and/or the stage of the formation of a peroxide derivative of vanadium.