Heteropolyacids in Catalysis

Kozhevnikov, Ivan V.; Matveev, K. I.

doi:10.1070/rc1982v051n11abeh002941

Cited by 127 publications

(47 citation statements)

References 4 publications

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“…[11][12][13][14][15][31][32][33][34][35][36][37][38][39][40][41][42][43] A remarkable property of heteropolyacids as solid catalysts is the formation of pseudoliquid phase, which is caused by the absorption of polar molecules such as water and alcohols followed by the interaction with protons and heteropolyanions. A key structure displaying the interaction is a planar (R ) H, CH 3 , C 2 H 5 , etc.).…”

Section: Introductionmentioning

confidence: 99%

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺

2004

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The in situ IR spectra of H 3 PW 12 O 40 ‚nH 2 O (n ) 0-6.2) in the range 4000-1100 cm -1 were measured, and that of H 3 PW 12 O 40 ‚6H 2 O (i.e., [H 5 O 2 + ] 3 [PW 12 O 40 3-]) with planar H 5 O 2 + was investigated. The spectrum showed a broad continuum below 3700 cm -1 , with peaks at 3420, 2720, 2030, and 1640 cm -1 , and was deconvoluted into five bands at 3420, 2720, 2030, 1780, and 1640 cm -1 . These bands, except for 2030 cm -1 , were shifted by the deuteration and are assigned to the vibration modes of the planar structure. The vibration modes of the simplified model H 5 O 2 + ‚4OW(OH) 4 (OH 2 ) were calculated by the quantum chemical method with the B3LYP

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Section: Introductionmentioning

confidence: 99%

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺

2004

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“…Similar result we observe for 1-methylanthraquinone. Most likely this is caused by the less product loss due to the side oxidation processes occurring in the excess of HPA, which is a rather strong oxidant with solution redox potential of about 1.0 V [17]. Therefore one may essentially reduce catalyst weight in case of substituted AQ, thus using molar ratio substrate: HPA lower than 2:1.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Production of Substituted Anthraquinones via the Diene Synthesis in the Presence of Mo-V-P Heteropoly Acid Solutions

Gogin¹,

Жижина²

2014

MRC

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Acid-catalytic 1,3-butadiene condensation with para-quinones followed by the obtained product oxidation may be performed in one stage as one-pot process, if assisted by the aqueous solutions of Mo-V-P heteropoly acids with a composition of HaPzMoyVxOb. 1,4-naphthoquinone (NQ) condensation with 1,3-butadiene in HPA solutions (brutto-composition H15P4Mo18V7O89 and H17P3Mo16V10O89) in the presence of hydrophylic organic solvents (acetone, 1,4-dioxane) provides 70% yield of 9,10-anthraquinone (AQ) containing no less than 90% AQ. In the same conditions reaction NQ with substituted 1,3-butadienes in the presence of the aqueous H17P3Mo16V10O89 (HPA-10) solution allows to prepare substituted AQ with yield up to 90% and purity up to 99%. The catalysts are regenerated by oxygen in separate stage and are reused.

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“…According to literature data [53], neutralization via basic hydrolysis of the PTA heteropoly anion results in stepwise decomposition of HPAn into phosphate and tungstate anions. According to literature data [53], neutralization via basic hydrolysis of the PTA heteropoly anion results in stepwise decomposition of HPAn into phosphate and tungstate anions.…”

Section: Formation Of 2d Network Of Polyepoxides On the Surface Of Amentioning

confidence: 95%

10.1007/s11124-008-1001-2

2000

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Heteropolyacids in Catalysis

Cited by 127 publications

References 4 publications

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺

One-Pot Production of Substituted Anthraquinones via the Diene Synthesis in the Presence of Mo-V-P Heteropoly Acid Solutions

10.1007/s11124-008-1001-2

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Heteropolyacids in Catalysis

Cited by 127 publications

References 4 publications

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H5O2+

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H5O2+

One-Pot Production of Substituted Anthraquinones via the Diene Synthesis in the Presence of Mo-V-P Heteropoly Acid Solutions

10.1007/s11124-008-1001-2

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In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺