Rh-complex catalysed directed hydrogenation of (α-hydroxyalkyl)vinyl sulfones follows the same stereochemical course as the corresponding acrylates, via HO-coordination; hydrogenation of the related (α-hydroxyalkyl)vinyl sulfoxides is directed by S–O coordination, which overrides HO-participation and is shown to be general.
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Ando et al. (1992) studied this question.
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