Functionalization of magnetite–chitosan nanocomposite with molybdenum complexes: new efficient catalysts for epoxidation of olefins
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Functionalization of magnetite–chitosan core–shell-type nanocomposite with molybdenum–Schiff base complex through a simple step-by-step path results in the preparation of new catalysts for the epoxidation of olefins. The functionalized nanocomposites were characterized by Fourier-transform infrared spectroscopy, X-ray diffractometry, energy-dispersive X-ray spectroscopy, scanning electron microscopy and vibrating-sample magnetometry. Finally, their abilities to catalyze the epoxidation of olefins with tert-butyl hydroperoxide in chloroform were evaluated. It was found that the prepared functionalized nanocomposites have high catalytic activities for heterogeneous epoxidation of olefins with epoxide as the main product in all cases. In particular, when the cyclooctene was employed as olefin, complete conversion and selectivity for epoxycyclooctene and high turnover frequency were obtained at 60 °C. The functionalized nanocomposites can be easily separated magnetically for reusing, and no activity loss was observed in five consecutive runs.
The authors gratefully acknowledge the financial support of Kharazmi University (Grant Number: 174461).