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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 terapeutisk virksomme 6-halogen-1α,2α-methylen-16α-methyl-&Delta<4,6>-pregnadien-17α-ol-3,20-dioner eller deres 17-estere.
Fremgangsmåde til fremstilling af 16-halogenmethylen-17α-hydroxy-20-keto-steroider af pregnan-, 19-norpregnan- eller iso-pregnanrækken eller 17α-estere deraf.