A single diastereoisomer of phenyl epiandrosterone sulphite and the single diastereoisomer of benzyl epiandrosterone sulphite derived from it by nucleophilic substitution with benzyl alcohol have both been shown by X-ray crystallographic analysis to have the Rs configuration and hence the reaction proceeds with inversion at sulphur.
C. L. L. Chai, V. Humphreys, K. Prout and G. Lowe, J. Chem. Soc., Chem. Commun., 1991, 1597 DOI: 10.1039/C39910001597
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