Microwave-assisted preparation of cyclic ureas from diamines in the presence of ZnO |
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| Authors: | Yong Jin Kim |
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| Affiliation: | Sustainable Technology Division, National Risk Management Research Laboratory, U.S. Environmental Protection Agency, 26 W. Martin Luther King Dr., MS 443, Cincinnati, OH 45268, USA |
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| Abstract: | A microwave-assisted facile method for the preparation of various ureas, cyclic ureas, and urethanes has been developed that affords nearly quantitative yield of products at 120 °C (150 W), 71 kPa within 10 min using ZnO as a catalyst. The enhanced selectivity in this reaction is attributed to the deployment of ZnO whose absence results in poor yield and the generation of byproducts. |
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| Keywords: | Microwave-assisted synthesis Diamine Cyclic urea Urethane ZnO |
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