Articles producció científica> Química Física i Inorgànica

NHC-stabilised Rh nanoparticles: Surface study and application in the catalytic hydrogenation of aromatic substrates 

  • Identification data

    Identifier: PC:3117
    Authors:
    Blondeau, P.Martinez-Espinar, F.Nolis, P.Chaudret, B.Claver, C.Castillón, S.Godard, C.
    Abstract:
    New Rh-NPs stabilised by N-Heterocyclic Carbenes (NHC) were synthesized by decomposition of [Rh(g3-C3H5)3] under H2 atmosphere and fully characterized. Surface studies by FT-IR and NMR spectroscopy employing isotopically labelled ligands were also performed. The Rh0.2 NPs are active catalysts in the reduction of various aromatic substrates. In the reduction of phenol, high selectivities to cyclohexanone or cyclohexanol were obtained depending on the reaction conditions. However, this catalytic system exhibited much lower activity in the hydrogenation of substituted phenols. Pyridine was easily hydrogenated under mild conditions and interestingly, the hydrogenation of 4-methyl and 4- trifluoromethylpyridine resulted slower than that of 2-methylpyridine. The hydrogenation of 1- (pyridin-2-yl)propan-2-one provided the b-enaminone 13a in high yield as a consequence of the partial reduction of the pyridine ring followed by isomerization. Quinoline could be either partially hydrogenated to 1,2,3,4-tetrahydroquinoline or fully reduced to decahydroquinoline by adjusting the reaction conditions.
  • Others:

    Author, as appears in the article.: Blondeau, P.; Martinez-Espinar, F. ; Nolis, P. ; Chaudret, B. ; Claver, C. ; Castillón, S. ; Godard, C.
    Department: Química Física i Inorgànica Química Analítica i Química Orgànica
    URV's Author/s: BLONDEAU , PASCAL JEAN CLAUDE LEON; Martinez-Espinar, F. ; Nolis, P. ; Chaudret, B. ; CLAVER CABRERO, MARIA DEL CARMEN OROSIA; CASTILLÓN MIRANDA, SERGIO; GODARD , CYRIL
    Keywords: hydrogenation NHCs rhodium nanoparticles
    Abstract: New Rh-NPs stabilised by N-Heterocyclic Carbenes (NHC) were synthesized by decomposition of [Rh(g3-C3H5)3] under H2 atmosphere and fully characterized. Surface studies by FT-IR and NMR spectroscopy employing isotopically labelled ligands were also performed. The Rh0.2 NPs are active catalysts in the reduction of various aromatic substrates. In the reduction of phenol, high selectivities to cyclohexanone or cyclohexanol were obtained depending on the reaction conditions. However, this catalytic system exhibited much lower activity in the hydrogenation of substituted phenols. Pyridine was easily hydrogenated under mild conditions and interestingly, the hydrogenation of 4-methyl and 4- trifluoromethylpyridine resulted slower than that of 2-methylpyridine. The hydrogenation of 1- (pyridin-2-yl)propan-2-one provided the b-enaminone 13a in high yield as a consequence of the partial reduction of the pyridine ring followed by isomerization. Quinoline could be either partially hydrogenated to 1,2,3,4-tetrahydroquinoline or fully reduced to decahydroquinoline by adjusting the reaction conditions.
    Research group: Síntesis Orgànica Estereoselectiva Organometàl.lics i Catàlisi Homogènia Grup de Quimiometria, Qualimetria i Nanosensors
    Thematic Areas: Chemistry Química Química
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 0021-9517
    Author identifier: 0000-0003-1331-5055; ; ; ; 0000-0002-2518-7401; 0000-0002-0690-7549; 0000-0001-5762-4904
    Record's date: 2018-02-21
    Last page: 127
    Journal volume: 354
    Papper version: info:eu-repo/semantics/acceptedVersion
    Link to the original source: https://www.sciencedirect.com/science/article/pii/S0021951717302956
    Funding program: altres; Grupos consolidados; 2014SGR670 plan; Retos; CTQ2016-75016-R, AEI/FEDER, UE altres; Grant Marti Franquès- URV ; 2013PMF-PIPF-90
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.1016/j.jcat.2017.08.010
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2017
    First page: 113
    Publication Type: Article Artículo Article
  • Keywords:

    Hidrogenació
    Rodi
    hydrogenation
    NHCs
    rhodium nanoparticles
    Chemistry
    Química
    Química
    0021-9517
  • Documents:

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