Arene Hydrogenation with a Stabilised Aqueous Rhodium(0) Suspension: A Major Effect of the Surfactant Counter-Anion

Authors

  • Alain Roucoux,

    1. Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6052 “Synthèses et Activations de Biomolécules,” Institut de Chimie de Rennes, Avenue du Gal Leclerc, 35700 Rennes, France Fax: (+33)-2-2323-8199
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  • Jürgen Schulz,

    1. Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6052 “Synthèses et Activations de Biomolécules,” Institut de Chimie de Rennes, Avenue du Gal Leclerc, 35700 Rennes, France Fax: (+33)-2-2323-8199
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  • Henri Patin

    1. Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6052 “Synthèses et Activations de Biomolécules,” Institut de Chimie de Rennes, Avenue du Gal Leclerc, 35700 Rennes, France Fax: (+33)-2-2323-8199
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Abstract

A reduced aqueous colloidal suspension of rhodium shows an efficient activity in the catalytic hydrogenation of various benzene derivatives under biphasic conditions at room temperature and under atmospheric hydrogen pressure. The rhodium nanoparticles in the size range of 2–2.5 nm have been synthesised by reducing RhCl3⋅3 H2O with sodium borohydride and were stabilised by highly water-soluble N,N-dimethyl-N-cetyl-N-(2-hydroxyethyl)ammonium salts (HEA16X, X=Br, Cl, I, CH3SO3, BF4). The major influence of the counter-ion of these surfactants on catalytic activity and recycling is described. The best results have been obtained with chloride ammonium salts HEA16Cl.

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