The light catalysed bromination of αβ-unsaturated steroidal ketones has been studied in the presence of an epoxide as a hydrobromic acid scavenger. In these conditions an uncommon regio- and stereo-selectivity for a radical reaction is observed and only 6β-brominated products are formed.
V. Calo, L. Lopez and G. Pesce, J. Chem. Soc., Perkin Trans. 2, 1976, 247 DOI: 10.1039/P29760000247
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