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Process for the preparation of 16α, 17α-acetals or ketals of 3-oxo-16α, 17α-dihydroxy-19-nor-4-pregnenes or 3-oxo-16α, 17α-dihydroxy-19-nor-5 (10) - pregnener.
Process for the preparation of therapeutically effective 6-halogen-1α, 2α-methylene-16α-methyl- & Delta <4,6> -pregnadien-17α-ol-3,20-diones or their 17-esters.
Process for the preparation of 16-halomethylene-17α-hydroxy-20-keto-steroids of the pregnane, 19-norpregnan or iso-pregnane series or 17α-esters thereof.