Heteropoly 12-metallophosphates containing tungsten and vanadium. Preparation, voltammetry, and properties of mono-, di-, tetra-, and hexavanado complexes

Smith, Dorothy P.; Pope, Michael T.

doi:10.1021/ic50120a018

Cited by 87 publications

(54 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[36,37] As a matter of fact, the direct hydrothermal metalation (H 2 O, 150°C) of the lacunary precursor (2 ϫ 10 Ϫ3 ) in the presence of stoichiometric amounts of tungstate, molybdate or vanadate anions, in the first two cases does not lead to products, while in the latter case the disubstituted complex is formed. This conclusion has been reached by ESI-MS analysis of the reaction mixtures, showing, for the vanadium-containing system, the replacement of the reagent signals with two new ion peaks at m/z ϭ 873 and 1313, attributed to [LiHPV 2 W 10 …”

Section: Resultsmentioning

confidence: 99%

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW₁₁O₃₉]^p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOⁿ⁺ (M = W^VI, Mo^VI, V^V) Unit into the Polyoxometalate Vacancy

et al. 2003

View full text Add to dashboard Cite

ESI-MS analysis provides a straightforward tool for the solution characterization of highly charged mono-lacunary Keggin-type polyoxotungstates α- [XW 11 O 39 ] p− (X = Si, P; p = 8, 7). Doubly and triply charged quasi-molecular ion peaks were identified on the basis of both the theoretical simulation of the isotopic cluster distributions and the fragmentation modes observed with MS/MS technique. This approach allows the characterization of the inorganic polyanions transferred into the gas-phase with associated alkali metal cations (Li + , Na + ). Indeed, the ESI-MS spectrum was found to be dependent on the counterion nature and on the initial concen-

show abstract

Section: Resultsmentioning

confidence: 99%

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW₁₁O₃₉]^p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOⁿ⁺ (M = W^VI, Mo^VI, V^V) Unit into the Polyoxometalate Vacancy

et al. 2003

View full text Add to dashboard Cite

show abstract

“…Potassium salt of the heteropolyoxometalates, K5[Hx-2PVxW12-xO40] (x = 4 and 6), were prepared following the known procedure 32 .…”

Section: Syntheses Of Catalysts Potassium Salt Of the Heteropolyoxomementioning

confidence: 99%

Room Temperature Epoxidation of Alkenes With Hydrogen Peroxide Catalyzed by Heteropolyoxometalate

Agarwalla¹

2018

RJC

View full text Add to dashboard Cite

Keggin-type heteropolyoxometalates have been explored as catalysts for the epoxidation of alkenes at room temperature. Alkenes have been catalytically oxidized to the corresponding epoxides using mild and environmentally benign hydrogen peroxide as terminal oxidant. For vanadium(V)-substituted heteropolyoxometalates 5-(x = 4 for POM 1 and 6 for POM 2), the efficiency of the catalyst towards epoxidation of alkenes is found to be dependent on the amount of vanadium atoms present in the POM catalyst and also on the nature of the reaction medium.

show abstract

“…NPMoV was prepared according to the Pope method 18) . Combustion analysis and ICP measurement found that NPMoV has a mean atomic ratio of N/P/Mo/V = 5.0/1.0/4.0/7.8.…”

Section: Preparation Of Molybdovanadophosphatesmentioning

confidence: 99%

モリブドバナドリン酸塩／酸素系を利用した不飽和炭化水素類の酢酸パラジウム (Ii) による酸化反応

隆洋

聡

康敬

2003

J. Jpn. Petrol. Inst.

View full text Add to dashboard Cite

Molybdovanadophosphoric acids (HPMoV) and their salts (NPMoV) partly substituted with an ammonium cation are efficient reoxidation systems for the Pd(OAc)2-catalyzed oxidation of alkenes and arenes with molecular oxygen. Acetoxylation of various cycloalkenes to 3-acetoxy-1-cycloalkenes was performed in good yields by the Pd(OAc)2/NPMoV/O2 system combined with hydroquinone. Oxidation of cyclohexene and styrene to the corresponding ketones by the same catalytic system in a mixed solvent of ethanol and water formed cyclohexanone and acetophenone, respectively, in fair to good yields. Monosubstituted alkenes such as ethyl acrylate and acrylonitrile underwent acetalization by this catalytic system to give the corresponding acetals in quantitative yields. Wacker-type oxidation of long-chain terminal alkenes by the present catalytic system was successfully achieved in the presence of a small amount of chloride ion. For example, oxidation of 1-octene formed 2-octanone (83%) as the major product, and the formation of undesired 3-octanone was less than 1%. The regioselectivity and yield of ketones were improved by dropwise addition of alkenes to the reaction system. The Pd(OAc)2/NPMoV/O2 system also acts as a good oxidation system for the carbomethoxylation of alkenes. Cyclopentene was carbomethoxylated under a mixture of CO (0.5 MPa) and air (0.5 MPa) to give dimethyl cis-1,2-and cis-1,3-cyclopentanedicarboxylates in good yields. Oxidative coupling reaction of benzene to biphenyl was performed by Pd(OAc)2 combined with HPMoV under dioxygen at 90°C. The best turn-over number of Pd(OAc)2 reached 109 and the yield of biphenyl was 14.3% based on the benzene used.

show abstract

Heteropoly 12-metallophosphates containing tungsten and vanadium. Preparation, voltammetry, and properties of mono-, di-, tetra-, and hexavanado complexes

Abstract: Council of Canada. Technical assistance was rendered by Mrs. B. Krizsan and Mrs. A. Salios. P. A. Y. gratefully acknowledges financial support of a MacMillan Family Foundation fellowship.

Cited by 87 publications

References 2 publications

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW₁₁O₃₉]^p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOⁿ⁺ (M = W^VI, Mo^VI, V^V) Unit into the Polyoxometalate Vacancy

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW₁₁O₃₉]^p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOⁿ⁺ (M = W^VI, Mo^VI, V^V) Unit into the Polyoxometalate Vacancy

Room Temperature Epoxidation of Alkenes With Hydrogen Peroxide Catalyzed by Heteropolyoxometalate

モリブドバナドリン酸塩／酸素系を利用した不飽和炭化水素類の酢酸パラジウム (Ii) による酸化反応

Contact Info

Product

Resources

About

Heteropoly 12-metallophosphates containing tungsten and vanadium. Preparation, voltammetry, and properties of mono-, di-, tetra-, and hexavanado complexes

Abstract: Council of Canada. Technical assistance was rendered by Mrs. B. Krizsan and Mrs. A. Salios. P. A. Y. gratefully acknowledges financial support of a MacMillan Family Foundation fellowship.

Cited by 87 publications

References 2 publications

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW11O39]p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOn+ (M = WVI, MoVI, VV) Unit into the Polyoxometalate Vacancy

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW11O39]p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOn+ (M = WVI, MoVI, VV) Unit into the Polyoxometalate Vacancy

Room Temperature Epoxidation of Alkenes With Hydrogen Peroxide Catalyzed by Heteropolyoxometalate

モリブドバナドリン酸塩／酸素系を利用した不飽和炭化水素類の酢酸パラジウム (Ii) による酸化反応

Contact Info

Product

Resources

About

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW₁₁O₃₉]^p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOⁿ⁺ (M = W^VI, Mo^VI, V^V) Unit into the Polyoxometalate Vacancy

Electrospray Behavior of Lacunary Keggin‐Type Polyoxotungstates [XW₁₁O₃₉]^p− (X = Si, P): Mass Spectrometric Evidence for a Concentration‐Dependent Incorporation of an MOⁿ⁺ (M = W^VI, Mo^VI, V^V) Unit into the Polyoxometalate Vacancy