 The resulting 16-dehydropregnenolone (3-hydroxypregna-5,16-dien-20-one) can be converted into progesterone in two steps.Firstly, the double bond in ring D is hydrogenated, followed by Oppenauer oxidation of the hydroxyl group and the concurrent migration of the remaining olefin from ring B to ring A so that it is in conjugation with the ketone carbonyl group at position 3.It can also be converted into testosterone, estrone and estradiol.