Nanoparticle supported, magnetically separable vanadium complex as catalyst for selective oxidation of sulfides

摘要

A magnetically recyclable vanadium(V) catalyst was synthesized by covalent anchoring of VO(salen)Cl on silica-coated Fe_3O_4 nanoparticles. This straightforward preparation yields magnetically separable Fe_3O_4@SiO_2@VO(salen) nanoparticles with high vanadium loading. These nanoparticles were efficient catalysts for selective oxidation of sulfides to corresponding sulfoxides with urea hydrogen peroxide in excellent yields. Leaching and recycling experiments revealed that the nanocatalyst can be applied for nearly complete oxidation of sulfides for at least five successive cycles.