Functionalized nanoparticles as catalysts for enantioselective processes

Roy, Sarabindu; Pericàs, Miquel À.

doi:10.1039/b903921j

Cited by 142 publications

(65 citation statements)

References 49 publications

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“…[87][88][89][90][91][92] Such catalysts can be more useful than the traditional homogeneous asymmetric catalysts due to the advantages of easy separation, efficient recycling, and overall lower costs. For example, palladium NPs modified by chiral ligands has drawn much attention in the field of asymmetric catalysis [93][94][95][96] (the in-depth discussion of these systems is outside the scope of this Perspective, as the discrimination between homogeneous and heterogeneous catalysis is often challenging for Pd catalysts).…”

Section: Chiral Ligands and Modifiers For Asymmetric Catalysismentioning

confidence: 99%

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

2016

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Transition metal nanoparticles are privileged materials in catalysis due to their high specific surface areas and abundance of active catalytic sites. While many of these catalysts are quite useful, we are only beginning to understand the underlying catalytic mechanisms. Opening the "black box" of nanoparticle catalysis is essential to achieve the ultimate goal of catalysis by design. In this Perspective we highlight recent work addressing the topic of controlled catalysis with bimetallic alloy and "designer" adsorbate-stabilized metal nanoparticles.

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Section: Chiral Ligands and Modifiers For Asymmetric Catalysismentioning

confidence: 99%

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

2016

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“…Nanoparticles have recently attracted much attention as alternative support materials for homogeneous catalyst immobilization [11][12][13]. The use of nanoparticles as a support can lead to significant enhancement of catalyst activity but the problem of catalyst recovery from the reaction mixture still remains because nanoparticle materials are easily dispersed in solution and cannot be efficiently filtered out of the reaction medium.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Schiff Base Complex Covalently Anchored to Silica-Coated Cobalt Ferrite Nanoparticles as a Novel Heterogeneous Catalyst for the Oxidation of Alkenes

Kooti

Afshari

2012

Catal Lett

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Silica-coated cobalt ferrite nanoparticles were prepared and functionalized with Schiff base groups to yield immobilized bidentate ligands. The functionalized magnetic nanoparticles were then treated with Mo (O 2 ) 2 (acac) 2 , resulting in the novel immobilized molybdenum Schiff base catalyst. The as-prepared catalyst was characterized by X-ray powder diffraction, transmission electron microscopy, vibrating sample magnetometry, thermogravimetric analysis, Fourier transform infrared, and inductively coupled plasma atomic emission spectroscopy. The immobilized molybdenum complex was shown to be an efficient heterogeneous catalyst for the oxidation of various alkenes using t-BuOOH as oxidant. This catalyst, which is easily recovered by simple magnetic decantation, could be reused several times without significant degradation in catalytic activity.

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“…Even if more and more organic transformations are using metal nanoparticles (MNPs) as catalysts [1][2][3][4][5][6], few of them concern enantioselective processes (for selected reviews, see [7][8][9][10]). The enantioselective catalysis on surfaces is commonly explained by three main mechanisms: the presence of chiral crystalline atomic structures at the surface, chiral adsorbates which modify the surface and chiral modifiers which control the approach of the substrate on the surface [11,12].…”

Section: Introductionmentioning

confidence: 99%

P-Stereogenic Phosphines for the Stabilisation of Metal Nanoparticles. A Surface State Study

et al. 2016

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Palladium and ruthenium nanoparticles have been prepared following the organometallic precursor decomposition methodology, under dihydrogen pressure and in the presence of borane protected P-stereogenic phosphines. NMR (Nuclear Magnetic Resonance) monitoring of the corresponding syntheses has permitted to determine the optimal metal/ligand ratio for leading to small and well-dispersed nanoparticles. Exchange ligand reactions of the as-prepared materials have proven the strong interaction of the phosphines with the metal surface; only oxidative treatment using hydrogen peroxide could release the phosphine-based stabiliser from the metal surface. Pd and Ru nanoparticles have been evaluated in hydrogenation reactions, confirming the robustness of the stabilisers, which selectively permitted the hydrogenation of exocyclic C=C bonds, preventing the coordination of the aromatic rings and as a result, their hydrogenation.

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Functionalized nanoparticles as catalysts for enantioselective processes

Abstract: Functionalized nanoparticles find increasing application as catalysts for enantioselective transformations. In this account the different strategies followed for the preparation of chirally modified nanoparticles and their application in asymmetric catalysis are reviewed.

Cited by 142 publications

References 49 publications

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

Molybdenum Schiff Base Complex Covalently Anchored to Silica-Coated Cobalt Ferrite Nanoparticles as a Novel Heterogeneous Catalyst for the Oxidation of Alkenes

P-Stereogenic Phosphines for the Stabilisation of Metal Nanoparticles. A Surface State Study

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