Recently, magnetic nanoparticles have been extensively employed as alternative catalyst supports, in view of their high surface area. In this light nano catalyst Fe3O4 could easily be separated and recover from the reaction mixture with an external magnet and reused several times [1]. Sulfoxides are valuable synthetic intermediates for the synthesis of chemically and biologically important and significant molecules. The main synthetic route for the preparation of these valuable materials is oxidation of the corresponding sulfides [2,3]. In this work, oxidation of sulfides to sulfoxids using Zr(IV) modified Fe3O4 has been reported in 35 oC temperature. R 1 S R 2 R 1 S R 2
