James R. Hanson, Peter B. Hitchcock, Suha N. Al-Jayyousi and Cavit Uyanik
Spectroscopic and crystallographic studies shows that the epoxidation, osmylation and bromination of 17β-acetoxy-5β-androst-3-ene takes place from the β-face of the alkene and that a diequatorial dibromide and bromohydrin accompany the diaxial addition products.