Jr. Hanson et al., THE STEREOCHEMISTRY OF EPOXIDATION OF DELTA(5)-STEROIDS WITH SODIUM PERBORATE AND POTASSIUM-PERMANGANATE, Journal of chemical research. Synopses, (1), 1998, pp. 50-51
Sodium perborate, with potassium permanganate as a catalyst, has been
shown to be a novel reagent for the epoxidation of steroidal 5-enes wi
th the attack occurring predominantly on the beta-face.