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Title
Japanese:Highly Selective Epoxidation of Cycloaliphatic Alkenes with Aqueous Hydrogen Peroxide Catalyzed by [PO4{WO(O2)2}4]3−/Imidazole 
English:Highly Selective Epoxidation of Cycloaliphatic Alkenes with Aqueous Hydrogen Peroxide Catalyzed by [PO4{WO(O2)2}4]3−/Imidazole 
Author
Japanese: 鎌田慶吾, Kosei Sugahara, Ryo Ishimoto, Susumu Nojima, Motoya Okazaki, 松本隆也, 水野哲孝.  
English: Keigo Kamata, Kosei Sugahara, Ryo Ishimoto, Susumu Nojima, Motoya Okazaki, Takaya Matsumoto, noritaka mizuno.  
Language English 
Journal/Book name
Japanese:ChemCatChem 
English:ChemCatChem 
Volume, Number, Page Vol. 6    No. 8    pp. 2327-2332
Published date July 2014 
Publisher
Japanese:Wiley-VCH Verlag GmbH & Co. KGaA 
English:Wiley-VCH Verlag GmbH & Co. KGaA 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.1002/cctc.201402268
 
DOI https://doi.org/10.1002/cctc.201402268
Abstract In the presence of imidazole as an additive, a phosphorus-contg. tetranuclear peroxotungstate, THA3[PO4{WO(O2)2}4] (I, THA = tetra-n-hexylammonium), could act as an efficient catalyst for epoxidn. of cycloaliph. alkenes with 30% aq. hydrogen peroxide (H2O2). Compd. I showed higher catalytic activity and selectivity to epoxide than other tungstates. By using the I/imidazole system, various kinds of cycloaliph. alkenes could be highly selectively converted into the acid-sensitive epoxides including industrially important diepoxide in high to excellent yields under the almost stoichiometric conditions. The 1H NMR spectroscopy showed that imidazole would work not only as a proton acceptor but also as a Lewis base to remarkably suppress the acid-catalyzed ring opening of epoxides. ﾂｩ 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. [on SciFinder(R)]

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