An environmentally benign method for the synthesis of symmetrical N, N′-disubstituted thioureas in a water medium using poly(ethylene glycol)-400 (PEG-400) as a catalyst and a microwave as a heating source is described. Diaryl- and dialkyl-thioureas efficiently are synthesized by the reactions of thiourea with a variety of amines. This protocol has advantages of (a) no use of hazardous reagents and volatile organic solvents, (b) a rapid reaction rate, (c) a high yield, and (d) a simple work-up procedure.
An Environmentally Benign Method for the Synthesis of Symmetrical N, N ′-Disubstituted Thioureas in a Water Medium
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