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Stereochemistry at proton exchange alpha to a sulfoxide group
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The factors which are responsible for the preferential exchange of one diastereotopic proton over another have been examined in studying a series of benzyl alkyl sulfoxides. Comparison of relative rates with stereochemistry shows that at least two effects contribute to the observed results. These are the orientation of the carbanion with respect to the lone pair on sulfur and with respect to the benzene ring.

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