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Epoxidation of alkenes with NaIO4 catalyzed by an efficient and reusable natural polymer-supported ruthenium(III) salophen catalyst
Ardakani, M. Hatefi Department of Chemistry - Faculty of Science - Vali-e-Asr University of Rafsanjan , Moghadam, M Catalysis Division - Department of Chemistry - University of Isfahan , Saeednia, S Department of Chemistry - Faculty of Science - Vali-e-Asr University of Rafsanjan , Pakdin-Parizi, Z Department of Chemistry - Faculty of Science - Vali-e-Asr University of Rafsanjan
In the present study, preparation, characterization, and catalytic activity of Ru(salophen)Cl supported on chitosan were investigated. The prepared heterogeneous catalyst was characterized by diffuse reflectance UV–vis and FT-IR spectroscopic techniques, scanning electron microscopy, and neutron activation analysis. In this catalytic system, the effects of different solvents were studied in the epoxidation of cis-cyclooctene and CH3CN/H2O was found to be a better solvent. Also, the effects of oxygen donors such as NaIO4, H2O2, H2O2/urea(UHP), tert-BuOOH, NaClO, and Bu4NIO4 were studied in the epoxidation of cis-cyclooctene and NaIO4 was selected as an oxidant. The catalytic activity of this new heterogeneous catalyst in the epoxidation of cyclic and linear alkenes using NaIO4 as an oxidant in CH3CN/H2O at room temperature was studied. The obtained results led us to conclude that [Ru(salophen)Cl@ chitosan] is an efficient catalyst for the epoxidation of alkenes with NaIO4. The catalyst can be readily recovered simply by filtration and reused several times without any significant loss in its catalytic activity.
Ru(III)salophen , Chitosan , Alkene epoxidation , Sodium periodate , Heterogeneous catalyst
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