Heterogeneous Catalytic Oxidative Bromination and Oxidation of Thioethers By Vanadium

Vanadium(IV) oxido complex of 1-Phenyl-1,3-butanedione [V.sup.IVO(bzac).sub.2] (1) was prepared, characterized, and heterogenized onto APTMS modified graphene oxide, as well as imidazole modified polystyrene beads. Graphene oxide supported complex GO-APTMS-[V.sup.IVO(bzac).sub.2] (2) and polymer anchored complex PS-im-[V.sup.IVO(bzac).sub.2] (3) were used for the oxidative bromination of a number of small organic molecules and oxidation of a series of thioethers. Both 2 and 3 evolve as excellent heterogeneous catalysts. The nature of solid support does not impact substrate conversion (%) during the oxidative bromination of salicylaldehyde, phenol, or styrene, whereas it influences the substrate conversion (%) as well as the product selectivity (%) during the oxidation of thioethers.