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A dimeric titanium-containing polyoxometalate. Synthesis, characterization, and catalysis of H2O2-based thioether oxidation.
The previously unknown titanium(IV)-containing mu-hydroxo dimeric heteropolytungstate (Bu4N)7[(PTiW11O39)2-OH] (TBA salt of H1) has been synthesized and shows higher catalytic activity than 2 for thioether oxidation by hydrogen peroxide in acetonitrile. Expand
Advances in the synthesis of polyoxometalates and in the study of heteropolyacids
The review surveys data on the known structures of polyoxometalates. The changes in this field which have occurred in the last ten years are traced. Heteropolyacids are considered in detail as aExpand
Esterification of n-Butanol with Acetic Acid in the Presence of Heteropoly Acids with Different Structures and Compositions
The esterification reaction of n-butanol with acetic acid ([BuOH] : [HOAc] = 1 : 15 mol/mol; 55°C, 5% H2O) was studied in the presence of tungsten heteropoly acids of the Keggin (H3PW12O40,Expand
ZrIV-Monosubstituted Keggin-Type Dimeric Polyoxometalates: Synthesis, Characterization, Catalysis of H2O2-Based Oxidations, and Theoretical Study
The previously unknown ZrIV-monosubstituted Keggin-type polyoxometalates (Zr-POMs), (n-Bu4N)7H[{PW11O39Zr(μ-OH)}2] (1), (n-Bu4N)8[{PW11O39Zr(μ-OH)}2] (2), and (n-Bu4N)9[{PW11O39Zr}2(μ-OH)(μ-O)] (3)Expand
Polyoxometalate-based heterogeneous catalysts for liquid phase selective oxidations: Comparison of different strategies
Abstract Recent achievements in the preparation of polyoxometalate-based heterogeneous catalysts using different immobilization techniques, such as embedding into a silica matrix by sol–gel method,Expand
Synthesis, characterization, and reactivity of Ti(IV)-monosubstituted Keggin polyoxometalates.
Studies revealed that 1-3 and 5 afford the same protonated titanium peroxo complex [Bu4N]4[HPTi(O2)W11O39] (I) upon interaction with aqueous H2O2 in MeCN, laying a basis for a better understanding of the nature of the reactivity of titanium in Ti-catalyzed oxidations. Expand
The role of protons in cyclohexene oxidation with H2O2 catalysed by Ti(IV)-monosubstituted Keggin polyoxometalate
Abstract The effect of the number of protons in the Ti(IV)-monosubstituted Keggin polyoxometalate Na 5 −  n H n PTiW 11 O 40 ( n  = 1–5; Ti-POM) on its catalytic behaviour in cyclohexene (CyH)Expand
Aerobic oxidation of formaldehyde mediated by a Ce-containing polyoxometalate under mild conditions.
Several lines of evidence, including the parabolic kinetic order in 1, nonlinear Arrhenius plot, independence of the rate on O2 pressure, presence of titratable H2O2 and HCO3H intermediates, and inhibition by conventional radical scavengers, all indicate the O2-based oxidations proceed by complex homolytic chemistry. Expand
Highly Selective Oxidation of Alkylphenols to p-Benzoquinones with Aqueous Hydrogen Peroxide Catalyzed by Divanadium-Substituted Polyoxotungstates
The catalytic performance of divanadium- and dititanium-substituted γ-Keggin polyoxotungstates, TBA4H[γ-PW10V2O40] (I, TBA = tetra-n-butylammonium), TBA4H2[γ-SiW10V2O40] (II), andExpand
Kinetics and mechanism of thioether oxidation with H2O2 in the presence of Ti(IV)-substituted heteropolytungstates
Abstract Kinetics of thioether oxidation with concentrated (86%) and diluted (35%) aqueous H 2 O 2 in the presence of catalytic amounts of (Bu 4 N) 7 {[PW 11 O 39 Ti] 2 OH} dimericExpand