Abstract 9α-Hydroxylation of Δ 5-3β-hydroxysteroids (of androstane, pregnane, 24-nor-and 21, 24-bisnorcholane groups) was carried out by a Rhodococcus sp., isolated from a petroleum-containing soil sample. A large number of the investigated steroids was transformed into 9α-hydroxy-Δ 4-3-ketones in satisfactory yields (50–90%) at high initial concentrations of the substrates (0.5–5.0 g/L). The influence of some structural features of ...
