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Efficient oxidation of sulfides into sulfoxides catalyzed by a chitosan–Schiff base complex of Cu(II) supported on supramagnetic Fe3O4 nanoparticles

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Abstract

Sulfoxides are versatile synthetic intermediates for the preparation of biological products. Therefore, there is a need for efficient methods to oxidize sulfides into sulfoxides. Such oxidation may be catalyzed by magnetic nanocatalysts due to their good stability, easy synthesis, high surface area, low toxicity and easy separation by magnetic forces. Here we prepared a nanocatalyst by immobilization of the chitosan–Schiff base complex on supramagnetic Fe3O4 nanoparticles. The chitosan–Schiff base complex has been previously prepared by functionalization of chitosan with 5-bromosalicylaldehyde and metalation with copper(II) acetate. The catalyst was characterized by Fourier transform infrared, powder X-ray diffraction, transmission electron microscope, scanning electron microscopy, energy-dispersive X-ray spectroscopy and thermogravimetric analysis. Results show that the Fe3O4 nanoparticles and nanocatalyst were spherical in shape with an average size of 20 nm. Upon the covalently anchoring of chitosan–Schiff base Cu complex on the magnetic Fe3O4 nanoparticles, the average size increased to 60 nm. The prepared Fe3O4–chitosan–Schiff base Cu complex catalyzed very efficiently the oxidation of sulfides to sulfoxides with 100 % selectivity in all cases under green reaction conditions and excellent yields. Additionally, ease of recovery and reusability up to four cycles without noticeable loss of catalytic activity make the present protocol beneficial from industrial and environmental viewpoint.

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Acknowledgments

The authors gratefully acknowledge the funding support received from the Ilam University, Ilam, Iran, on this work.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Ilam University, P.O. Box 69315516, Ilam, Iran

    Ali Naghipour & Akram Fakhri

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  1. Ali Naghipour
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  2. Akram Fakhri
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Correspondence to Ali Naghipour.

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Naghipour, A., Fakhri, A. Efficient oxidation of sulfides into sulfoxides catalyzed by a chitosan–Schiff base complex of Cu(II) supported on supramagnetic Fe3O4 nanoparticles. Environ Chem Lett 14, 207–213 (2016). https://doi.org/10.1007/s10311-015-0545-z

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  • DOI: https://doi.org/10.1007/s10311-015-0545-z

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