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Rhodium, 5% on carbon is a useful reagent for the conversation of nitriles to primary amines and the hydrogenation of aromatic rings, pyridines, aldehydes and sugars. It is also used for the reduction of oximes to amines and for the reduction of nitrobenzene to phenylhydroxylamine using hydrazine hydrate as the hydrogen source.
Joseph J. Mrowca.; Thomas J. Katz. Catalysis of a Cycloaddition Reaction by Rhodium on Carbon. J. Am. Chem. Soc. 1966, 88 (17), 4012-4015 .
Morris Freifelder.; Ralph M. Robinson.; George R. Stone. Hydrogenation of Substituted Pyridines with Rhodium on Carbon Catalyst. J. Org. Chem. 1962, 27 (1), 284-286.
Rhodium catalysts are especially useful for the hydrogenation of aromatic rings under mild conditions. For details for the hydrogenation of 4-aminobenzoic acid to its hexahydro derivative under modest pressure, see: Org. Synth. Coll., 5, 670 (1973).
Rhodium catalysts have also been used for the reduction of oximes to amines.
For a monograph on catalytic hydrogenation, see: P. N. Rylander, Hydrogenation Methods, Academic Press, N.Y. (1985).
For the reduction of nitrobenzene to phenylhydroxylamine using hydrazine hydrate as the hydrogen source, see: Org. Synth. Coll., 8, 16 (1993).
Hazard Statements: H228-H315-H319-H335
Flammable solid. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P210-P261-P280a-P305+P351+P338-P405-P501a
Keep away from heat/sparks/open flames/hot surfaces. - No smoking. Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves and eye/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.