Oxidative dehydrogenation of isobutyric acid on H4PVMo11O40, NaxH4-xPVMo11O40 and CUyH4-2yPVMo11O40 heteropolyacid catalysts supported on silica

Aboukaı̈s, Antoine; Ghoussoub, Denise; Blouet-Crusson, Emilie; Rigole, Monique; Guelton, M.

doi:10.1016/0926-860x(94)85045-3

“…The use of heteropoly compounds as homogenous catalysts has its own drawbacks including recovery and recyclability issues and hence lot of effort has been made to heterogenise HPAs [21][22][23][24][25][26][27]. Most of the heteropoly salts are insoluble in non-polar solvents such as benzene, toluene and hydrocarbons and these are known to act as catalysts even in insoluble reaction medium [28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Shanbhag¹,

Palraj²,

Halligudi³

2008

TOOCJ

5

1

0

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Abstract:The hydroamination reaction offers a very attractive route for the synthesis of alkylated amines and their derivatives with no byproduct formation. Heterogeneous intermolecular hydroamination reactions of alkynes with aromatic amines using different inexpensive copper salts of hetropolyacid catalysts were investigated. Among heteropoly salts, copper salts of silicotungstic acid showed highest activity. Reactivity of aromatic amines increased with increase in its basicity. Acidity in heterogeneous catalyst can act as promoter in hydroamination of alkynes.

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“…The use of heteropoly compounds as homogenous catalysts has its own drawbacks including recovery and recyclability issues and hence lot of effort has been made to heterogenise HPAs [21][22][23][24][25][26][27]. Most of the heteropoly salts are insoluble in non-polar solvents such as benzene, toluene and hydrocarbons and these are known to act as catalysts even in insoluble reaction medium [28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Shanbhag¹,

Palraj²,

Halligudi³

2008

TOOCJ

View full text Add to dashboard Cite

Abstract:The hydroamination reaction offers a very attractive route for the synthesis of alkylated amines and their derivatives with no byproduct formation. Heterogeneous intermolecular hydroamination reactions of alkynes with aromatic amines using different inexpensive copper salts of hetropolyacid catalysts were investigated. Among heteropoly salts, copper salts of silicotungstic acid showed highest activity. Reactivity of aromatic amines increased with increase in its basicity. Acidity in heterogeneous catalyst can act as promoter in hydroamination of alkynes.

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“…The report that VO 2+ works catalytically for the oxidative dehydrogenation of isobutyric acid 53 supports the idea. The decrease in selectivity to MAA at a vanadium content of 3 in Tables and would be related to the formation of VO 2 , which has been postulated. , …”

Section: Discussionmentioning

confidence: 74%

Oxidation of Isobutane Catalyzed by Partially Salified Cesium Molybdovanadophosphoric Acids

Mizuno

¹

,

Yahiro

²

1998

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The catalytic activity for the oxidation of isobutane catalyzed by 12-molybdophosphoric acid was much changed by the V5+- and Cs+-substitution for Mo6+ and H+, respectively. The best yield of methacrylic acid was 9.0% and was obtained for the heteropoly catalyst with V and Cs contents of 1 and 2.5, respectively. The high catalytic activity obtained for Cs2.5Ni0.08H1.34PVMo11O40 is presumably due to the high surface area. The activities of 12-molybdovanadophosphoric acids as well as those of 12-molybdophosphoric acid partially salified with Cs+ were controlled by the oxidizing ability of catalysts. The conversion vs selectivity relationships, the simulation of the data, and kinetic results for Cs2.5Ni0.08H1.34PVMo11O40 and Cs2.5Ni0.08H0.34PMo12O40 catalysts show that the first steps, i.e., selective and complete oxidation reactions of isobutane, are rate-determining and mainly catalyzed by molybdenum ion and that vanadium ion efficiently accelerates the selective oxidation of methacrolein to methacrylic acid. Cs+-substitution for H+ in H3.84Ni0.08PVMo11O40 greatly change the selectivity up to a Cs content of 2.5 and suppressed the elimination of the vanadium ion from the Keggin anion.

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Oxidative dehydrogenation of isobutyric acid on H4PVMo11O40, NaxH4-xPVMo11O40 and CUyH4-2yPVMo11O40 heteropolyacid catalysts supported on silica

Cited by 30 publications

References 20 publications

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Hydroamination of Terminal Alkynes by Amines Catalyzed by Copper Heteropoly Salts: A Simple Approach Towards Imine Synthesis

Oxidation of Isobutane Catalyzed by Partially Salified Cesium Molybdovanadophosphoric Acids

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