Unprecedented efficient hydrogenation of arenes in biphasic liquid–liquid catalysis by re-usable aqueous colloidal suspensions of rhodium

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A reduced aqueous colloidal suspension of rhodium shows efficient activity for the catalytic hydrogenation of various benzene derivatives under biphasic conditions at room temperature and under atmospheric hydrogen pressure; the aqueous phase containing the Rh(0) particles can be re-used for further runs with a complete conservation of activity.