An unusual dehydrogenation of steroidal Δ5(10),9(11)-dienes

Abstract Dehydrogenation of a Δ 5(10),9(11) -3-keto Δ 5(10),9(11) -3-hydroxy-steroid with 2,3-dichloro-5,6-dicyano- p -benzoquinone afforded the corresponding Δ 4,9,11 -3-ketone.