Photo-bromination of 4,4-dimethyl-Δ5-steroids
Abstract
Irradiation of a mixture of 1 equiv. of a 4,4-dimethyl-Δ5-steroid with 2 equiv. of N-bromosuccinimide gives a 4,4-dimethyl-7,7-dibromo-Δ5-steroid, which can be converted into a 4,4-dimethyl-7-bromo-Δ5,7-steroid or into a 4,4-dimethyl-7-oxo-Δ5-steroid.