A novel route for the synthesis of the water-soluble ruthenium complex, HRu(CO)Cl(TPPMS)3]·2H2O (I) is reported. The synthesis of I was accomplished via ligand exchange, in a biphasic water/toluene medium, after 4 h of refluxing. TPPMS is the sodium salt of monosulfonated-triphenylphosphine, Ph2P(C6H4SO3Na)·3H2O]. Complex I has been previously reported in the literature, but attempts to obtain it by the indicated route resulted in a mixture of products, difficult to separate (Z. Toth, F. Joó and M.T. Beck, Inorg. Chim. Acta, 42 (1980) 153-161). The characterization of I was achieved by spectroscopy methods, including XPS. The water stability of I was followed by UV-Vis spectroscopy, before and after its use as a catalyst precursor in the hydrogenation of olefins. I is stable in water and shows catalytic activity. It hydrogenated styrene to ethylbenzene (TN/h 3.0; 86% conversion) and cyclohexene to cyclohexane (TN/h: 1.1;25% conversion), in a biphasic water/decaline mixture. The hydrogenation is influenced by stirring. © 1995.
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