Publication Date:
2003-05-10
Description:
Epoxides are an important class of industrial chemicals that have been used as chemical intermediates. Catalytic epoxidation of olefins affords an interesting production technology. We found a widely usable green route to the production of epoxides: A silicotungstate compound, [gamma-SiW10O34(H2O)2]4-, is synthesized by protonation of a divacant, lacunary, Keggin-type polyoxometalate of [gamma-SiW10O36]8- and exhibits high catalytic performance for the epoxidation of various olefins, including propylene, with a hydrogen peroxide (H2O2) oxidant at 305 kelvin. The effectiveness of this catalyst is evidenced by 〉/=99% selectivity to epoxide, 〉/=99% efficiency of H2O2 utilization, high stereospecificity, and easy recovery of the catalyst from the homogeneous reaction mixture.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kamata, Keigo -- Yonehara, Koji -- Sumida, Yasutaka -- Yamaguchi, Kazuya -- Hikichi, Shiro -- Mizuno, Noritaka -- New York, N.Y. -- Science. 2003 May 9;300(5621):964-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Applied Chemistry, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyoku, Tokyo 113-8656, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12738860" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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