| Abstrakt: |
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 Bu4NIO4were studied in the epoxidation of cis-cyclooctene and NaIO4was selected as an oxidant. The catalytic activity of this new heterogeneous catalyst in the epoxidation of cyclic and linear alkenes using NaIO4as 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. |
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