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Racemic 2‐substituted 1,3‐oxathianes were oxidized with good to high enantiomer‐differentiation by using urea hydrogen peroxide addition compound as oxidant in the presence of a catalytic amount of di‐μ‐oxo Ti(salen) complex, giving the corresponding sulfoxides diastereoselectively. Chirality 15:24–27, 2003.
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Saito et al. (2002) studied this question.
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