Sulfonation of chiral aryl phosphanes occurs readily in high yields when they contain C6H4-p-(CH2)3-C6H5 groups. The diphosphane 1 synthesized in this way is surface active and increases the activity and selectivity of Rh catalysts for the hydrogenation of cinnamic acid derivatives in two-phase systems.
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Ding et al. (1995) studied this question.
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