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• W2063982009 abstract "Addition of a dilute acetic acid solution of 8-quinolinol to an H2O2 solution of freshly precipitated H2WO4·2H2O furnishes a yellow adduct [WO(O2)2·2QOH] 1 which, on crystallization from a suitable solvent, affords orange-yellow complex [WO(O2)(QO)2] 2. When 2 reacts stoichiometrically with olefinic compounds in a 1∶1 molar ratio, the respective olefins are epoxidized and 2 is converted to the orange-red [WO2(QO)2] 3. When 1 is treated with an excess of H2O2 (greater than 6 equiv.) and PPh4Cl, an anionic light yellow complex PPh4[WO(O2)2(QO)] 4 is obtained. 4 reacts with cyclopentene (a representative olefin) in a 1∶1 molar ratio producing cyclopentene oxide and itself is converted to PPh4[WO2(O2)(QO)] 5. If the above reaction is conducted at a 1∶2 molar ratio (instead of 1∶1) then 2 moles of the corresponding epoxide is formed and 4 is converted to PPh4[WO3(QO)] 6. All these peroxo complexes have remarkable catalytic efficiencies in the epoxidation of olefinic compounds when used in tandem with NaHCO3 as co-catalyst and H2O2 as oxidant in a CH3CN medium at room temperature, the method being green and economical. The catalyst 4under the above experimental conditions shows so far unmatched efficiency in epoxidizing a wide variety of olefinic substrates." @default.
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• W2063982009 date "2006-01-01" @default.
• W2063982009 modified "2023-10-16" @default.
• W2063982009 title "Highly facile homogeneous epoxidation of olefins using oxo-diperoxo tungstate(vi) complex as catalyst, bicarbonate as co-catalyst and hydrogen peroxide as a terminal oxidant" @default.
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• W2063982009 doi "https://doi.org/10.1039/b514258j" @default.
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