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  • Publication
    Métadonnées seulement
    Supramolecular cluster catalysis: Facts and problems
    (: American Chemical Society, 2003) ; ;
    Vieille-Petit, Ludovic
    ;
    Tschan, Mathieu
    ;
    Romakh, Vladimir B.
    ;
    Ward, Thomas R.
    Organometallic catalysis is generally thought to proceed through a catalytic cycle which involves coordination of the substrate to the metal center and decoordination of the product after the transformation. The water-sol. trinuclear cluster cation [H3Ru3(C6H6)(C6Me6)2(O)]+ (1) and derivs. thereof seem to catalyze the hydrogenation of benzene under biphasic conditions without prior coordination of the substrate, the interactions between catalyst and substrate relying on supramol. host-guest contacts thanks to the hydrophobic pocket spanned by the three arene ligands in the catalyst mol. The concept of supramol. cluster catalysis, the isolation and characterization of the catalyst-substrate host-guest complexes postulated, as well as errors and problems with this chem. will be discussed. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Catalytic functionalization of methane
    (: John Wiley & Sons Ltd, 1999) ;
    Stanislas, Sandrine
    ;
    Shul'pin, Georgiy B
    ;
    Nizova, Galina V
    A mixture of sodium vanadate and pyrazine-2-carboxylic acid (pcaH) efficiently catalyses the reaction of methane with molecular oxygen (from air) and hydrogen peroxide to give methyl hydroperoxide and, as consecutive products, methanol and formaldehyde, The reaction takes place under mild conditions (25-75 degrees C) either in aqueous or in acetonitrile solution. The complexes formed from the catalyst precursor and the co-catalyst (under the reaction conditions) have been isolated and characterized as the derivatives [VO2(pca)(2)](-) (1) and [VO(O-2) (pca)(2)](-) (3). The implications of these species in the catalytic process are discussed. Copyright (C) 2000 John Wiley & Sons, Ltd.