H3PW12O40supported on functionalized polyoxometalate organic–inorganic hybrid nanoparticles as efficient catalysts for three-component Mannich-type reactions in water

Khoshnavazi, Roushan; Bahrami, Leila; Havasi, Forugh; Naseri, Elham

doi:10.1039/c6ra27519b

Cited by 24 publications

(10 citation statements)

References 62 publications

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“…New phosphotungstic acid-based NPs have been prepared on the surface of organic–inorganic polyoxometalate NPs of H 6 Cu 2 [PPDA] 6 [SiW 9 Cu 3 O 37 ]·12H 2 O (HybPOM; PPDA = p -phenylenediamine) and GO/Fe 3 O 4 /HybPOM NPs that possess strong and sufficiently acidic sites . Higher yield was achieved within a shorter time for three-component Mannich-type reactions in water than in ethanol, polyethylene glycol, ethyl acetate, or dichloromethane.…”

Section: Metal-based Catalystsmentioning

confidence: 99%

Catalytic Organic Reactions in Water toward Sustainable Society

et al. 2017

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Traditional organic synthesis relies heavily on organic solvents for a multitude of tasks, including dissolving the components and facilitating chemical reactions, because many reagents and reactive species are incompatible or immiscible with water. Given that they are used in vast quantities as compared to reactants, solvents have been the focus of environmental concerns. Along with reducing the environmental impact of organic synthesis, the use of water as a reaction medium also benefits chemical processes by simplifying operations, allowing mild reaction conditions, and sometimes delivering unforeseen reactivities and selectivities. After the "watershed" in organic synthesis revealed the importance of water, the development of water-compatible catalysts has flourished, triggering a quantum leap in water-centered organic synthesis. Given that organic compounds are typically practically insoluble in water, simple extractive workup can readily separate a water-soluble homogeneous catalyst as an aqueous solution from a product that is soluble in organic solvents. In contrast, the use of heterogeneous catalysts facilitates catalyst recycling by allowing simple centrifugation and filtration methods to be used. This Review addresses advances over the past decade in catalytic reactions using water as a reaction medium.

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Section: Metal-based Catalystsmentioning

confidence: 99%

Catalytic Organic Reactions in Water toward Sustainable Society

et al. 2017

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“…[ 19 ] At present, although numerous efforts of the two reactions catalyzed by POMs have been developed to overcome drawbacks associated with the classical oxidation of sulfides and Mannich reactions, problems like harsh reaction conditions, reusing and recycling of catalysts, difficulty in products separation still remain concerns. [ 20 ] To the best of our knowledge, the reports about decavanadate‐based transition metal hybrids serving as bifunctional catalysts in selective oxidation of sulfides and construction of C—C bonds have been rarely reported.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Decavanadate‐based Transition Metal Hybrids as Bifunctional Catalysts for Sulfide Oxidation and C—C Bond Construction

Huang

et al. 2021

Chin. J. Chem.

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Main observation and conclusion The development of bifunctional catalysts has drawn much attention in realizing efficient and feasible catalytic systems to meet the diverse demand of potential industrial applications. Design of stable and powerful bifunctional catalysts for various catalysis systems is highly desirable yet largely unmet. Here, three kinds of decavanadate‐based transition metal hybrids (DTMH) (i.e., Co‐DTMH, Ni‐DTMH and Ag‐DTMH) have been successfully synthesized through a pH tuning strategy and further characterized. Specifically, the rare MO5N six‐coordinated transition metal coordination modes have been detected in Co‐DTMH and Ni‐DTMH, while Ag atoms in Ag‐DTMH exhibited three‐ and five‐coordinated geometries with the tuning of specially selected imidazole ligands. Thus‐obtained clusters can serve as powerful bifunctional catalysts for both sulfide oxidation and C—C bond construction. Remarkably, Ag‐DTMH demonstrated excellent heterogeneous bifunctional catalytic properties in the selective oxidation of sulfides and construction of C—C bond (yields up to 99%), which enable successful recycling for three cycles with remained catalytic activities and structure stability. The newly designed decavanadate‐based transition metal hybrids with bifunctional property hold high promise in the practical applications like continuous catalysis or flow bed reactions.

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“…1,2 It is a practical and efficient method for the construction of both allylic and benzylic amines, important targets that are found in many biologically active molecules and which are useful synthetic intermediates employed in the total syntheses of alkaloids and other complex molecules. [3][4][5][6][7] This reaction is considered to be a very effective strategy for the synthesis of useful compounds as building blocks in pharmaceuticals and natural products such as antimicrobial, 8 cytotoxic, 9 anticancer 10 and analgesic activity. 11,12 Polyoxometalates (POMs), discrete anionic metal-oxo clusters, can be linked together through cationic moieties to build materials with incredible structural diversity which exhibit a wide variety of compositions and structural versatility, as well as important optical, catalytic, and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Designing a novel tetradentate polyoxometalate eco-catalyst for the synthesis of β-aminocyclohexanone derivatives in water

2018

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H₃PW₁₂O₄₀supported on functionalized polyoxometalate organic–inorganic hybrid nanoparticles as efficient catalysts for three-component Mannich-type reactions in water

Abstract: H3PW12O40 was immobilized on organic–inorganic polyoxometalates nanoparticles of HybPOM and Go/Fe3O4/HybPOM nanocomposite and characterized. The catalytic activities of the catalysts were probed through Mannich-type reactions in water.

Cited by 24 publications

References 62 publications

Catalytic Organic Reactions in Water toward Sustainable Society

Catalytic Organic Reactions in Water toward Sustainable Society

Decavanadate‐based Transition Metal Hybrids as Bifunctional Catalysts for Sulfide Oxidation and C—C Bond Construction

Designing a novel tetradentate polyoxometalate eco-catalyst for the synthesis of β-aminocyclohexanone derivatives in water

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