Polyoxometalate-based phase transfer catalysis for liquid–solid organic reactions: a review

Zhou, Yu; Guo, Zengjing; Hou, Wei; Wang, Qian; Wang, Jun

doi:10.1039/c5cy00674k

Cited by 89 publications

(46 citation statements)

References 80 publications

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“…Since the publication of these two landmark papers, progress on self-precipitating transition metal catalysts has been slow. With some exceptions, such as a redox-switchable phase-tagged ruthenium-based catalyst [9], the solid-liquid-solid phase separation procedures are either reaction-controlled [10][11][12][13][14][15][16][17][18][19][20] or thermoregulated [21][22][23][24], and involve polyoxometalate salts of large organic cations [25].…”

Section: Introductionmentioning

confidence: 99%

Metal oxide-triazole hybrids as heterogeneous or reaction-induced self-separating catalysts

Amarante

Neves

Valente

et al. 2016

Journal of Catalysis

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Section: Introductionmentioning

confidence: 99%

Metal oxide-triazole hybrids as heterogeneous or reaction-induced self-separating catalysts

Amarante

Neves

Valente

et al. 2016

Journal of Catalysis

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“…into the vacant sites has been used to synthesize several metal-substituted POMs with controlled multinuclear active sites in both aqueous and organic media [7,11,23]. These molecular catalysts exhibit significant activity and selectivity for a wide range of reactions [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] [92][93][94].…”

Section: Transition-metal-substituted Polyoxometalatesmentioning

confidence: 99%

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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“…Furthermore, Mg3Al-P2W17Zn is stable and can be easily separated from the reaction system. The recycled Mg3Al-P2W17Zn material retains its structural features and composition of the individual components, which has been confirmed by Fourier transform infrared (FT-IR), X-ray diffraction, 31 P NMR, and X-ray photoelectron spectroscopy characterization. The scaled-up experiment provided further support for its potential use for industrial applications.…”

Section: Oxidation Catalystmentioning

confidence: 82%

“…Their formation is mainly based on the appropriate charge to ionic radius ratio and charge density which: (i) prohibits infinite polymerization; (ii) promotes formation of π-bonds with the O 2− ligands; (iii) exhibits flexible and various coordination geometries. In the past decades, the properties of POMs have been extensively investigated due to a wide range of composition, sizes, rich redox chemistry, charge distribution and photochemistry to fulfill specific requirements in a variety of applications, including functional materials in catalysis, molecular electronics, magnetism, materials science and medicine [28][29][30][31]. Based on the above observations, various groups reported their efforts to design POM-based heterogeneous catalytic systems for the promotion of specific reactions.…”

Section: Pom-ldh Composite Materialsmentioning

confidence: 99%

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

Miras

Song

2017

Catalysts

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Layered double hydroxides (LDHs) are an important large class of two-dimensional (2D) anionic lamellar materials that possess flexible modular structure, facile exchangeability of inter-lamellar guest anions and uniform distribution of metal cations in the layer. Owing to the modular accessible gallery and unique inter-lamellar chemical environment, polyoxometalates (POMs) intercalated with LDHs has shown a vast array of physical properties with applications in environment, energy, catalysis, etc. Here we describe how polyoxometalate clusters can be used as building components for the construction of systems with important catalytic properties. This review article mainly focuses on the discussion of new synthetic approaches developed recently that allow the incorporation of the element of design in the construction of a fundamentally new class of materials with pre-defined functionalities in catalytic applications. Introducing the element of design and taking control over the finally observed functionality we demonstrate the unique opportunity for engineering materials with modular properties for specific catalytic applications.Keywords: layered double hydroxides; polyoxometalates; intercalated materials Layered Double Hydroxides (LDHs)-Intro BackgroundLayered double hydroxides (LDHs) or hydrotalcite-like compounds are a large family of two-dimensional (2D) anionic clay materials made up of positively charged brucite-like layers with an interlayer region containing charge compensating anions and solvation molecules, which can be represented by the general formula -4]. As shown in Figure 1 and generally in the range of 0.20-0.33, which occupy the space between the layers compensating for the positive charge and inducing stability in the overall structure [5,6]. The M II /M III -based edge shared octahedra are used to construct 2D infinite sheets, whereas hydroxyl groups are organized on the vertices of the octahedra with the hydrogen atoms pointing toward the interlayer region, as a consequence forming a complex network of hydrogen bonds with the interlayer anions and water molecules [1,[7][8][9][10]. LDH-based materials are very attractive systems due to their robust structure,

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Polyoxometalate-based phase transfer catalysis for liquid–solid organic reactions: a review

Abstract: Recent progress in POM-based phase transfer catalysis for liquid–solid organic reactions is summarized in this review.

Cited by 89 publications

References 80 publications

Metal oxide-triazole hybrids as heterogeneous or reaction-induced self-separating catalysts

Metal oxide-triazole hybrids as heterogeneous or reaction-induced self-separating catalysts

Base Catalysis by Mono- and Polyoxometalates

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

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