Abstract
A Brønsted acidic deep eutectic solvent based on choline chloride and p-toluenesulfonic acid (ChCl/p-TsOH, 1:1) was prepared and utilised for the selective oxidation of sulfides with H2O2 as the oxidant. Broad substrate compatibility, good yields and selectivities, the reusability of the catalyst as well as the gram-scale synthesis are the major advantages of this protocol. Moreover, the use of ChCl/p-TsOH, instead of neat p-TsOH, can greatly reduce the acid sewage especially in large-scale synthetic processes.
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