1. New hybrid bidentate ligands as precursors for smart catalysts
- Author
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Goettmann, Frédéric, Boissière, Cédric, Grosso, David, Mercier, François, Le Floch, Pascal, Sanchez, Clément, Laboratoire Hétéroéléments et Coordination (DCPH), École polytechnique (X)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI) (LCMCP (site Paris VI)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
polarization ,entrapped opposing reagents ,tandem catalysis ,[CHIM.CATA]Chemical Sciences/Catalysis ,mesoporous materials ,P ligands ,one-pot sequences ,condensation ,heterogeneous catalysis ,rhodium ,[CHIM.COOR]Chemical Sciences/Coordination chemistry ,mesoporous silica ,supported catalysts ,hydroformylation - Abstract
11 pages; 1-Phosphanorbornadiene derivatives were grafted onto various periodically organized mesoporous powders, including a new zirconia/silica mixed oxide synthesized by aerosol techniques. After complexation with the [Rh(CO)(2)](+) fragment, these materials were revealed to be more active in olefin hydrogenation than their homogeneous counterparts. The reasons for this higher activity are discussed in the light of theoretical modeling. Various surface treatments, such as esterification, drying, and functionalization with PhSi(OEt)(3), provided insights into the nature and mechanism of formation of the active species. Zirconia-based materials were found to be active in internal olefin hydroformylation. Investigation of the mechanism of this reaction shows that the isomerization step is catalyzed by the Lewis acidic support, whereas the hydroformylation step is driven by the rhodium catalyst. Dissociation of these two steps leads to enhancement of activity.
- Published
- 2005