Ionic liquid supported on magnetic nanoparticles as highly efficient and recyclable catalyst for the synthesis of β-keto enol ethers

Li, Peihe; Li, Baole; Hu, Hai‐Chuan; Zhao, Xiaona; Zhang, Zhan‐Hui

doi:10.1016/j.catcom.2013.11.025

Cited by 55 publications

(7 citation statements)

References 31 publications

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“…Operational simplicity, low cost, high yields, wide applicability Also, Abu-Reziq et al [63] found that the Pt nanoparticles immobilized on MNPs modified with ionic liquids (ILs) are very efficient and reusable catalyst for the chemoselective hydrogenation of α,β-unsaturated aldehydes and alkynes. The adsorption of Pt nanoparticles on the IL-functionalized MNPs was obtained by ion exchange with K 2 PtCl 4 followed by reduction with hydrazine.…”

Section: Ionic Liquids Immobilized On Magnetic Nanoparticlesmentioning

confidence: 99%

Recent advances in catalysts immobilized on magnetic nanoparticles

Mokhtary

2016

J IRAN CHEM SOC

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2]. Furthermore, enhancing the percentages of exposed highly reactive facets, at nanoscale, does improve the efficiency of materials in various applications such as photocatalysis and dye-sensitized solar cells [3]. By presenting individual properties, nanoparticles can become a kind of structure unit, in other words, "artificial atoms" to conduct a new type of materials which have difficult in estimating collective properties [4]. Through green nanotechnology, we can get contrivable nanomaterial that contains unique characters which bulk materials never have [5]. This means that we are creating materials with good catalytic activity, stability and more selectivity via changing their forms, sizes and morphologies [6]. Applications of nanoparticles in catalytic reactions are because as size decreases, the surface area-to-volume ratio increases, which enhanced interaction between the reactant and the catalyst, which are needed for high catalytic efficiencies [7]. Unsupported nanoparticles are often less stable, and usually coagulation is inevitable during the catalytic reactions [8]. To generate stable nanoparticles with good activity, stabilizing the surface is required. Protection has been performed by the addition of polymers or longchain alkyl surfactants with polar functional groups that attached to the nanoparticle surface via covalent or electrostatic interactions [9, 10]. Alternatively, nanoparticles have been immobilized or grafted onto inorganic supports to improve their stabilization and recycling ability [12]. Progress in the discovery of new support materials for the heterogenization of homogeneous catalysts has been periodically reviewed [13]. In this article, the green catalytic processes and recent advances in organic transformations catalyzed by magnetically retrievable catalysts (MRCs) are highlighted. Prior to this, methods for the synthesis of catalysts immobilized on magnetic nanoparticles will be addressed briefly.Abstract Unsupported nanoparticles are often less stable, and usually coagulation is unavoidable during the catalytic reactions. To generate stable nanoparticles with good activity, stabilizing the surface is required. Protection has been performed by the addition of polymers or long-chain alkyl surfactants with polar functional groups that attached to the nanoparticle surface via covalent or electrostatic interactions. Alternatively, nanoparticles have been immobilized or grafted onto inorganic supports to improve their stabilization and recycling ability. In this article, the green catalytic processes and recent advances in organic transformations catalyzed by magnetically retrievable catalysts are reviewed. Prior to this, methods for the synthesis of catalysts immobilized on magnetic nanoparticles are addressed briefly.

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Section: Ionic Liquids Immobilized On Magnetic Nanoparticlesmentioning

confidence: 99%

Recent advances in catalysts immobilized on magnetic nanoparticles

Mokhtary

2016

J IRAN CHEM SOC

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“…The diphenylacetylene was hydrogenated in methanol using this catalyst at 90°C under hydrogen pressure with the selective preparation of cis-alkenes (Scheme 5). Anchoring Al x Cl y -IL onto the silica-coated γ-Fe 2 O 3 particles afforded Al x Cl y -IL-SiO 2 @γ-Fe 2 O 3 [11]. The catalyst assessment was performed to synthesis of β-ketoenol ethers (Scheme 6).…”

Section: Ionic Liquids Immobilized On Mnps In Multicomponent Reactionsmentioning

confidence: 99%

Ionic Liquids Immobilized on Magnetic Nanoparticles

Mokhtary¹

2017

Progress and Developments in Ionic Liquids

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Ionic liquids (ILs) immobilized on supports are among the most important derivatives of ILs. The immobilization process of ILs can transfer their desired properties to substrates. The combination of the advantages of ILs with those of support materials will derive new performances while retaining the properties of both moieties. As green media in organic catalytic reactions, based on utilizing the ability of ILs to stabilize the catalysts, they have many advantages over free ILs, including avoiding the leaching of ILs, reducing their amount, and improving the recoverability and reusability of both themselves and catalysts. This has critical significance from both environmental and economical points of view. Recently, ionic liquids immobilized on magnetic nanoparticles (MNPs) have drawn increasing attention in catalytic reactions and separation technologies and achieved substantial progress. The combination of MNPs and ILs gives magnetic-supported ionic liquids, which exhibit the unique properties of ILs as well as facile separation by an external magnetic field. The excellent efficiency of this kind of immobilized ionic liquids offers a great advantage compared with other sorts of magnetic supports. In this chapter, the green catalytic processes and recent advances in organic synthesis catalyzed by ionic liquids immobilized on magnetic nanoparticles are highlighted.

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“…Contrarily, heterogeneous catalysts could be recovered and recycled conveniently and efficiently, although their dispersion in reaction media have not been carried out well. To overcome these problems in the dispersion, recovery, and recycling of catalysts, ionic liquids have been immobilized onto solid materials such as organic polymers [ 42 , 43 , 44 ], inorganic supports (e.g., silica, alumina) [ 45 , 46 , 47 , 48 ], and magnetic nanoparticles (MNPs) [ 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. The improved catalysts have possessed the combined properties of homogeneous and heterogeneous catalysts, consisting of a larger surface area and catalyst-loading capacity, better dispersity in reaction media, and simple separation.…”

Section: Introductionmentioning

confidence: 99%

Chloroaluminate Ionic Liquid Immobilized on Magnetic Nanoparticles as a Heterogeneous Lewis Acidic Catalyst for the Friedel–Crafts Sulfonylation of Aromatic Compounds

Nguyen

Lê

et al. 2022

Molecules

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Chloroaluminate ionic liquid bound on magnetic nanoparticles (Fe3O4@O2Si[PrMIM]Cl·AlCl3) was prepared and used as a heterogenous Lewis acidic catalyst for the Friedel–Crafts sulfonylation of aromatic compounds with sulfonyl chlorides or p-toluenesulfonic anhydride. The catalyst’s stability, efficiency, easy recovery, and high recyclability without considerable loss of catalytic capability after four recycles were evidence of its advantages. Furthermore, the stoichiometry, wide substrate scope, short reaction time, high yield of sulfones, and solvent-free reaction condition also made this procedure practical, ecofriendly, and economical.

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Ionic liquid supported on magnetic nanoparticles as highly efficient and recyclable catalyst for the synthesis of β-keto enol ethers

Cited by 55 publications

References 31 publications

Recent advances in catalysts immobilized on magnetic nanoparticles

Recent advances in catalysts immobilized on magnetic nanoparticles

Ionic Liquids Immobilized on Magnetic Nanoparticles

Chloroaluminate Ionic Liquid Immobilized on Magnetic Nanoparticles as a Heterogeneous Lewis Acidic Catalyst for the Friedel–Crafts Sulfonylation of Aromatic Compounds

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