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Deep eutectic solvent (DES) has been identified as a highly efficient catalyst and reaction medium, for rapid oxidation of alcohols to aldehydes and ketones using N-bromosuccinimide as the oxidant. This mild procedure utilizes biodegradable and readily available choline chloride/urea-based DES for high-yield oxidation at room temperature or at 60 °C. Selective oxidation of secondary alcohols in the presence of primary alcohols can be achieved. Furthermore, the catalyst-free synthesis of 2-bromoacetophenone was achieved through DES-mediated tandem oxidation and bromination of alcohol.

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A Straightforward and Sustainable One-Pot, Four-Component Synthesis of Rhodanine Derivatives. -The condensation of ethyl chloroacetate, amines, carbon disulfide, and aldehydes proceeds under ultrasound irradiation to produce rhodanine derivatives in short reaction times. The reaction can also be conducted under stirring at room temperature but lower yields are obtained. -(AZIZI*, N.; HASANI, M.; KHAJEH, M.; EDRISI, M.; Tetrahedron Lett. 56 (2015) 10, 1189-1192, http://dx.