Carbonyl compounds were prepared by selective oxidation of alcohols in the presence of recoverable Fe3O4@SiO2@Pd magnetic nanocatalyst in aqueous media as a green solvent. Molecular oxygen served as an oxidant. The catalyst was removed from the reaction media by external magnetic field, washed with methanol, and reused for six more times without any considerable reduction in its reactivity. The chemoselectivity and regioselectivity of the catalyst can serve for selective oxidation of primary alcohols in the presence of secondaryones, and for oxidation of unhindered alcohols in the presence of hindered ones
