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Phosphorus, Sulfur, and Silicon and the Related Elements Volume 180, 2005 - Issue 12
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Original Articles

An Environmentally Benign Method for the Synthesis of Symmetrical N, N ′-Disubstituted Thioureas in a Water Medium

Zheng Li Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, People's Republic of China
,
Zhi-Yuan Wang Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, People's Republic of China
,
Yan-Long Zhao Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, People's Republic of China
,
Yu-Lin Xing Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, People's Republic of China
&
Wei Zhu Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, People's Republic of China
Pages 2745-2750 | Received 15 Feb 2005, Accepted 04 Mar 2005, Published online: 19 Aug 2006
 
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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.

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