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Highly Efficient Epoxidation of Alkenes with Sodium Periodate Catalyzed by Reusable Polystyrene-Bound Ruthenium(III) Salophen

M. Moghadam^a,*, V. Mirkhani^a,*, S. Tangestaninejad^a, I. Mohammadpoor-Baltork^a, H. Kargar^b, I. Sheikhshoaei^c and M. Hatefi^d

^aDepartment of Chemistry, Catalysis Division, University of Isfahan, Isfahan 81746-73441, Iran
^bDepartment of Chemistry, Payame Noor University,P.O. Box 19395-3697 Tehran, Islamic Republic of Iran
 ^cDepartment of Chemistry, Shahid Bahonar University, Kerman, Iran
^dDepartment of Chemistry, Faculty of Science, Vali-e-Asr University, 77176 Rafsanjan, Iran

      In this paper, highly efficient epoxidation of alkenes catalyzed by ruthenium(III) salophen chloride, [Ru(salophen)Cl], supported on functionalized chloromethylated polystyrene, PS, is reported. The PS was modified with 1,4-diaminobenzene, 4-aminophenol and 4-aminothiophenol, and [Ru(salophen)Cl] was attached to the supports via axial ligation. The prepared catalysts were used for efficient epoxidation of alkenes with NaIO₄ at room temperature. These new heterogenized catalysts were characterized by elemental analysis, FT-IR spectroscopy, scanning electron microscopy and transmission electron microscopy. The heterogeneous catalysts were reusable in the oxidation reactions and were reused several times.

Keywords: Ruthenium(III) salophen, Alkene epoxidation, Sodium periodate, Polystyrene, Heterogeneous catalysts