Efficient chemical fixation of CO2 promoted by a bifunctional Ag2WO4/Ph3P system

Song, Qing‐Wen; Yu, Bing; Li, Xuedong; Ma, Ran; Diao, Zhen‐Feng; Li, Rong-Guan; Li, Wei; He, Liang‐Nian

doi:10.1039/c3gc42406e

Cited by 195 publications

(104 citation statements)

References 53 publications

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“…Despite the weaker basicity of [WO 4 ] 2− (pK a of conjugate acid in water: 3.5), TBA 2 [WO 4 ] exhibited much higher catalytic activity than the strong inorganic and organic bases for the chemical fixation of CO 2 with various nucleophiles due to its bifunctional action towards CO 2 and substrates [38,42,45]. The combination of TBA 2 [WO 4 ] with various transition metal species such as Ag + [43,44,48,54]. …”

Section: Monomeric Metalatesmentioning

confidence: 99%

“…This bifunctionality facilitates the nucleophilic attack of the NH2 and OH groups on the carbon atom of CO2 to form the corresponding carbamic and carbonic acids followed by transformation to the final products. On the other hand, Cummins and co-workers reported that the reaction of After the report on the chemical fixation of CO2 with TBA2[WO4], various catalytic systems based on tungstates and niobates have been developed [48,[53][54][55][56][57]. The Ag2[WO4] catalyst system in combination with the Ph3P ligand could efficiently catalyze CO2 fixation such as carboxylative cyclization of propargyl alcohols and one-pot synthesis of oxazolidinones and carbamates (Schemes 4 and 5) [48,54].…”

Section: Chemical Fixation Of Co2mentioning

confidence: 99%

“…After the report on the chemical fixation of CO2 with TBA2[WO4], various catalytic systems based on tungstates and niobates have been developed [48,[53][54][55][56][57]. The Ag2[WO4] catalyst system in combination with the Ph3P ligand could efficiently catalyze CO2 fixation such as carboxylative cyclization of propargyl alcohols and one-pot synthesis of oxazolidinones and carbamates (Schemes 4 and 5) [48,54]. For example, the carboxylative cyclization of 2-methyl-3-butyn-2-ol proceeded under milder reaction conditions than those of TBA2[WO4] (i.e., under atmospheric pressure of CO2 at room temperature), and the Ag2[WO4]/Ph3P catalyst could be reused at least four times without significant loss of activity.…”

Section: Chemical Fixation Of Co2mentioning

confidence: 99%

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Base Catalysis by Mono- and Polyoxometalates

Kamata

Sugahara

2017

Catalysts

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Abstract:In sharp contrast with acid-, photo-, and oxidation-catalysis by polyoxometalates, base catalysis by polyoxometalates has scarcely been investigated. The use of polyoxometalates as base catalysts have very recently received much attention and has been extensively investigated. Numerous mono-and polyoxometalate base catalyst systems effective for the chemical fixation of CO 2 , cyanosilylation of carbonyl compounds, and C-C bond forming reactions have been developed. Mono-and polyoxometalate base catalysts are classified into four main groups with respect to their structures: (a) monomeric metalates; (b) isopolyoxometalates; (c) heteropolyoxometalates; and (d) transition-metal-substituted polyoxometalates. This review article focuses on the relationship among the molecular structures, the basic properties, and the unique base catalysis of polyoxometalates on the basis of groups (a)-(d). In addition, reaction mechanisms including the specific activation of substrates and/or reagents such as the abstraction of protons, nucleophilic action toward substrates, and bifunctional action in combination with metal catalysts are comprehensively summarized.

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Section: Monomeric Metalatesmentioning

confidence: 99%

Section: Chemical Fixation Of Co2mentioning

confidence: 99%

Section: Chemical Fixation Of Co2mentioning

confidence: 99%

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Base Catalysis by Mono- and Polyoxometalates

Kamata

Sugahara

2017

Catalysts

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“…A range of applications for silver tungstate is reported in the literature these include chemical fixation of CO 2 [22], a catalyst in organic chemistry [23], photoswitches [24], photocatalysis of organic pollutants [25][26][27][28][29][30], lubricants [31], electrocatalysis [32], gas sensor [33,34], LED [35] as well as an antimicrobial and antibacterial agents [36][37][38]. The influence of electron beam irradiation on structural and optical properties of this material has also been investigated [39].…”

Section: Introductionmentioning

confidence: 99%

Low temperature micro Raman and laser induced upconversion and downconversion spectra of europium doped silver tungstate Ag2−3xEuxWO4 nanorods

Pinatti

Ireland

Fern

et al. 2016

J Mater Sci: Mater Electron

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All the red emitting europium-doped silver tungstate a-Ag 2-3x Eu x WO 4 (x = 0.01-0.08 mol) phosphor reported herein crystalise as nanorods. The nanorods were structurally characterised by X-ray powder diffraction, Rietveld refinement, low temperature (20 to -190°C) micro-Raman spectroscopy . The morphology of the nanorods reported herein was confirmed by field emission scanning electron microscopy. The optical properties were studied using low temperature (20 to -190°C) high resolution laser excited upconversion and downconversion luminescence.

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“…It can be partially circumvented by the application of Mistunobu's reagent [18], or when reactive propargyl alcohols and an appropriate catalytic system is used [19].…”

Section: Introductionmentioning

confidence: 99%

Polymer- and Carbon Nanotube-Supported Heterogeneous Catalysts for the Synthesis of Carbamates from Halides, Amines, and CO2

et al. 2016

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A series of tetraalkylammonium catalysts immobilized on polystyrene or carbon nanotubes were investigated in a reaction between alkyl halides, amines, and CO 2 . The yield of carbamates was up to 85 % at 100°C and 1 MPa of CO 2 after 3 h (first stage 25°C, 1 h) in the presence of Cs 2 CO 3 and DMF as a solvent. The best results were achieved in the case of large ammonium substituents (C 4 and C 6 ) in the catalyst, benzyl amine, and benzyl chloride as reagents. The catalysts retained their activity after at least five cycles when carefully dried between cycles. Both polymer and carbon nanotube supports were equally effective, but the latter were less prone to deactivation. Graphical Abstract

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Efficient chemical fixation of CO2 promoted by a bifunctional Ag2WO4/Ph3P system

Cited by 195 publications

References 53 publications

Base Catalysis by Mono- and Polyoxometalates

Base Catalysis by Mono- and Polyoxometalates

Low temperature micro Raman and laser induced upconversion and downconversion spectra of europium doped silver tungstate Ag2−3xEuxWO4 nanorods

Polymer- and Carbon Nanotube-Supported Heterogeneous Catalysts for the Synthesis of Carbamates from Halides, Amines, and CO2

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