Regioselective hydrogenation of dienes catalyzed by palladium–aminosilane complexes grafted on MCM-41

Shimazu, Shogo; Baba, Nobuhiro; Ichikuni, Nobuyuki; Uematsu, Takayoshi

doi:10.1016/s1381-1169(01)00508-8

Cited by 29 publications

(25 citation statements)

References 12 publications

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“…For example, the confinement of homogeneous chiral catalyst within MCM-41 has been found to improve the enantioselectivity of asymmetric epoxidation and hydroformylation reactions [4]. MCM-41-supported Pd catalysts prepared by the grafting of a palladium complex onto MCM-41, exhibited high activity and high regioselectivity in the liquid-phase hydrogenation of dienes with -OH groups [5]. On the other hand, Mastalir et al [6] reported that the in situ generation of Pd nanoparticles in MCM-41, led to a lower activity with regards to liquid-phase alkyne hydrogenation, than those on the external surface of the mesoporous host due to limited access of the reactants in the mesoporous framework channels.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Catalytic Properties of Mesocellular Foam Silica Supported Pd Nanoparticles in the Liquid-Phase Selective Hydrogenation of Phenylacetylene

et al. 2011

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An ultra-large pore mesocellular foam silica (MCF) was employed as a support for preparation of supported Pd catalysts for the liquid-phase selective hydrogenation of phenylacetylene. The catalysts were prepared by three different routes: (i) incipient wetness impregnation using Pd(II)acetate solution (Pd/MCF-imp), (ii) impregnation of colloidal Pd nanoparticles obtained by the solvent reduction method (Pd/MCF-col), and (iii) in situ synthesis of MCF in the presence of the Pd colloid (Pd/MCF-ss). The conventional impregnation method resulted in more agglomeration of Pd particles and partial collapse of MCF structure, hence the Pd/MCF-imp exhibited the lowest selectivity towards styrene at total conversion of phenylacetylene. Only the Pd/MCF-ss, in which most of the Pd nanoparticles were encapsulated by the silica matrix, was found to retain high styrene selectivity ([80%) after complete conversion of phenylacetylene. Comparing to the other highly efficient Pd catalysts reported in the literature under similar reaction conditions, it can be emphasized that coverage of Pd surface by the support produces great beneficial effect for enhancing styrene selectivity, regardless of the type of supports used (i.e., TiO 2 , carbon nanotubes, or mesostructured silica).

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Section: Introductionmentioning

confidence: 99%

Characteristics and Catalytic Properties of Mesocellular Foam Silica Supported Pd Nanoparticles in the Liquid-Phase Selective Hydrogenation of Phenylacetylene

et al. 2011

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“…198,199 These reactions typically require control of the selectivity and, hence, careful catalyst design. 200 In order to prepare a series of supports surface-functionalised with ≡Si(CH 2 ) 3 NHCH 2 CH 2 NH 2 groups, Shimazu and co-workers 201 Han et al 206 synthesised a Pd(II)-loaded material from mesoporous silica modified by Nheterocyclic carbene ionic liquids with different alkyl chain lengths and tested them in hydrogenation of alkenes and allyl alcohol. The activity of the catalysts in the reduction of allyl alcohol was similar to that of commercial Pd/C catalyst, while in hydrogenation of 1-hexene and cyclohexene, the efficiency was lower than that of Pd/C.…”

Section: Hydrogenation Of Unsaturated Compoundsmentioning

confidence: 99%

Heterogeneous Pd catalysts supported on silica matrices

2014

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“…The results in many instances have indicated the appreciable efficiency obtained using these compounds as catalysts [5,6].…”

Section: Introductionmentioning

confidence: 97%

Catalytic application of mesoporous silica in the synthesis of substituted imidazoles under microwave irradiation and solvent‐free conditions

Kazemzad

Yuzbashi

Balalaie

2010

Phys. Status Solidi (c)

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The capability of synthesized mesoporous silica (sBA‐15) was evaluated for the catalytic synthesis of substituted imidazoles under microwave irradiation and solvent free condition. The synthesis was carried out via condensation of benzyl, ammonium acetate and benzaldehyde derivatives over the surface of the mesoporous silica catalyst. FT‐IR spectroscopy studies of the reaction products indicated the formation of the substituted imidazoles as the major compounds and therefore, suitability of the catalyst for this organic synthesis. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Regioselective hydrogenation of dienes catalyzed by palladium–aminosilane complexes grafted on MCM-41

Cited by 29 publications

References 12 publications

Characteristics and Catalytic Properties of Mesocellular Foam Silica Supported Pd Nanoparticles in the Liquid-Phase Selective Hydrogenation of Phenylacetylene

Characteristics and Catalytic Properties of Mesocellular Foam Silica Supported Pd Nanoparticles in the Liquid-Phase Selective Hydrogenation of Phenylacetylene

Heterogeneous Pd catalysts supported on silica matrices

Catalytic application of mesoporous silica in the synthesis of substituted imidazoles under microwave irradiation and solvent‐free conditions

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