Olefin Epoxidation with Hydrogen Peroxide Catalyzed by Lacunary Polyoxometalate [γ??SiW10O34 (H2O) 2] 4−

K Kamata, M Kotani, K Yamaguchi…

Index: Kamata, Keigo; Kotani, Miyuki; Yamaguchi, Kazuya; Hikichi, Shiro; Mizuno, Noritaka Chemistry - A European Journal, 2007 , vol. 13, # 2 p. 639 - 648

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Citation Number: 107

Abstract

Abstract The tetra-n-butylammonium (TBA) salt of the divacant Keggin-type polyoxometalate [TBA] 4 [γ-SiW 10 O 34 (H 2 O) 2](I) catalyzes the oxygen-transfer reactions of olefins, allylic alcohols, and sulfides with 30% aqueous hydrogen peroxide. The negative Hammett ρ+(− 0.99) for the competitive oxidation of p-substituted styrenes and the low value of (nucleophilic oxidation)/(total oxidation), X SO= 0.04, for I-catalyzed oxidation of ...