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Efficient and Reusable Sn(II)‐containing Imidazolium‐based Ionic Liquid as a Catalyst for the Oxidation of Benzyl Alcohol
Authors:Bingtong Wang  Yulin Hu  Dong Fang  Lin Wu  Rong Xing
Institution:1. College of Chemical and Environmental Engineering, Yancheng Teachers University, Jiangsu, China;2. College of Chemistry and Chemical Engineering, Nanjing Tech University, Jiangsu, China
Abstract:A simple and efficient catalytic system BBIM]Br–SnCl2 for the oxidation of benzyl alcohol using hydrogen peroxide as the oxidant has been developed. Reaction conditions such as the catalyst dose, the solvents, reaction temperature, reaction time, and the amount of hydrogen peroxide were investigated. The optimum reaction conditions identified were 0.11 g of catalyst, no solvent, 65°C, 15 min, and 2 mmol of hydrogen peroxide. Oxidation of various alcohols was also investigated under the optimized conditions. The catalyst BBIM]Br–SnCl2 can be easily recovered and reused for six reaction runs without significant loss of catalytic activity, because the Sn species of the catalyst can be coordinated with the imidazole ring of the ionic liquid. The reused catalyst was further characterized by Fourier transform infrared spectroscopy to evaluate its chemical properties. The results proved that the BBIM]Br–SnCl2 catalyst was stable and reusable for the oxidation reactions. A possible mechanism for the oxidation of benzyl alcohol to benzaldehyde is proposed.
Keywords:Ionic liquid  Tin(II) chloride dihydrate  Benzyl alcohol  Solvent‐free oxidation
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