The epoxidation of some androsta-4,6-dienes with m-chloroperbenzoic acid has been shown to give the 4β,5β;6α,7α-diepoxides, the stereochemistry can be rationalized in terms of the directing effect of one epoxide on the facial selectivity of the second epoxidation.
J. R. Hanson, P. B. Hitchcock and I. Kiran, J. Chem. Res. (S), 1999, 198 DOI: 10.1039/A809182J
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