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On the action of H2 in aqueous solutions, the water soluble analogue of Wilkinson's catalyst, [RhCl(tppms)3][tppmsP(C6H5)2(C6H4SO3Na)], gives [RhH(tppms)3] instead of [RhH2Cl(tppms)3] and this is reflected in the rates and selectivities of hydrogenations using this catalyst.
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Joó et al. (1993) studied this question.
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