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Fremgangsmåde til fremstilling af 16α,17α-acetaler eller -ketaler af 3-oxo-16α,17α-dihydroxy-19-nor-4-pregnener eller 3-oxo-16α,17α-dihydroxy-19-nor-5(10)-pregnener.
Fremgangsmåde til fremstilling af 16-halogenmethylen-17α-hydroxy-20-keto-steroider af pregnan-, 19-norpregnan- eller iso-pregnanrækken eller 17α-estere deraf.
Fremgangsmåde til fremstilling af 3-alkoxy- eller 3-aralkoxy-16-amino-Δ<3,5>-pregnadien-17α-ol-20-oner, eller 16-amino-Δ<4>-pregnen-17α-ol-3,20-dioner.