Abstract: New 24-homo vitamin D derivatives of formula I ##STR1## are described, in which R.sup.1 means a hydrogen atom, a hydroxy, an alkanoyloxy group with 1 to 8 carbon atoms or an aralkanoyloxy group with up to 8 carbon atoms,R.sup.2 and R.sup.3, independently of one another, mean a linear or branched alkyl group with 1 to 4 carbon atoms, a trifluoromethyl group or together mean a saturated carbocyclic ring with 3 to 9 carbon atoms formed with carbon atom 25,R.sup.4 and R.sup.5, independently of one another, mean a hydrogen atom, an alkanoyl group with 1 to 8 carbon atoms or an aralkanoyl group with up to 8 carbon atoms, andA and B each mean a hydrogen or together a second bond, andn stands for 1, 2, 3,4 or 5.

Abstract: The invention discloses side-chain homologous vitamin D derivatives of formula I ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, B, and D have the meanings defined in the specification and either (1) A is a direct bond between carbon atoms 20 and 22 and X is an oxy alkylene radical, --(CH.sub.2).sub.n O-- where n is 1 to 3; (2) A is a methylene bridge, --CH.sub.2 --, between carbon atoms 20 and 22 and X is either an alkylene radical, --(CH.sub.2).sub.n -- or an oxy alkylene radical, --(CH.sub.2).sub.n O--, where n is 1 to 3; or (3) if A is a direct bond and B and D together form a second bond, then X(R.sup.5) (R.sup.6) is ##STR2## The compounds possess proliferation-inhibiting and cell-differentiating activity.

Abstract: 23-Oxa-derivatives in the vitamin D series of formula I ##STR1## are described in which R.sup.1, R.sup.2 and R.sup.4 independently of one another mean a hydrogen atom or an acyl group with 1 to 9 carbon atoms,R.sup.3 each means a hydrogen atom or each a linear or branched alkyl group with 1 to 4 carbon atoms and X means an alkylene radical--(CH.sub.2).sub.n -- with n=1, 2, 3, and if n=1, R.sup.3 each cannot be a methyl or propyl group, as well as a process for their production.The compounds have proliferation-inhibiting and cell-differentiation effects and are suitable for the production of pharmaceutical agents.

Abstract: New 24-oxa derivatives in the vitamin D series of general formula I are described in whichR.sup.1, R.sup.2 and R.sup.5, independently of one another, mean a hydrogen atom or an acyl group with 1 to 9 carbon atoms,R.sup.3 means a hydrogen atom or a linear or branched alkyl group with 1 to 4 carbon atoms andR.sup.4 means a hydrogen atom each or a linear or branched alkyl group each with 1 to 4 carbon atoms.Pharmaceutical preparations which contain these compounds are also disclosed.

Abstract: Hydroxyalkane carboxylic acid derivatives of general formula I ##STR1## in which n means the numbers 7 to 18,R.sub.1 represents a hydrogen atom or an acyl group with a maximum of 16 carbon atoms, andoptionally an alkylene group with 4 to 8 carbon atoms interrupted by an oxygen atom or a nitrogen atom, are useful for the production of pharmaceutical agents for local treatment of diseases of the skin and mucous membranes.

Abstract: Androstane derivatives of the general Formula I ##STR1## in which R.sub.1 represents a hydrogen atom or a methyl group,X and Y each mean hydrogen atoms or together a carbon-carbon bond, andR.sub.2 symbolizes a hydrogen atom or an alkyl group with 1 to 6 carbon atoms,are pharmaceutically effective substances which have a distinct antiandrogenic effectiveness in topical application.

Abstract: Dermatics are claimed which are characterized in that they contain as the active compound one or two 17.beta.-methyl-18-nor steroids of general Formula I ##STR1## wherein is a single bond or a double bond,R.sub.1 is a hydrogen atom or a methyl group, andR.sub.2 is an alkyl group of maximally 6 carbon atoms, optionally substituted by an alkanoyloxy group containing 2-6 carbon atoms.