Abstract: 11-Oxoprostaglandin derivatives of the formula ##STR1## wherein R.sub.2 is a hydrogen atom or alkyl of 1-5 carbon atoms,R.sub.3 is alkyl of 1-5 carbon atoms, alkylaryl, cycloalkyl of 5-6 ring carbon atoms and a total of 5-10 carbon atoms; benzodioxol-2-yl, phenyl, naphthyl or phenyl or naphthyl substituted by phenyl, halogen, alkyl of 1-4 carbon atoms, chloromethyl, fluoromethyl, carboxyl or hydroxy;A is --CH.sub.2 --CH.sub.2 --, cis--CH.dbd.CH--, or trans--CH.dbd.CH--;B is --CH.sub.2 --CH.sub.2 -- or trans--CH.dbd.CH--,D and E collectively are a direct bond or D is alkylene of 1-5 carbon atoms and E is an oxygen or sulfur atom; esters thereof; readily cleavable 9,15 and 9,15 ethers thereof; methanesulfonylamides thereof, and physiologically acceptable salts thereof with bases; possess the activity of the corresponding natural prostaglandins with a surprisingly longer duration of effectiveness, greater selectivity, and better effects, and can be produced, e.g.

Abstract: Prostan-1-ol esters and intermediates for their preparation are described; the former compounds exhibit improved organ specificity and a longer duration of activity at lower dosages than the corresponding non-esterified prostaglandins and are useful, inter alia, in triggering abortion, inducing labor and regulating the menstrual cycle.

Abstract: Prostan-1-ol esters and intermediates for their preparation are described; the former compounds exhibit improved organ specificity and a longer duration of activity at lower dosages than the corresponding non-esterified prostaglandins and are useful, inter alia, in triggering abortion, inducing labor and regulating the menstrual cycle.

Abstract: Prostan-1-ol esters and intermediates for their preparation are described; the former compounds exhibit improved organ specificity and a longer duration of activity at lower dosages than the corresponding non-esterified prostaglandins and are useful, inter alia, in triggering abortion, inducing labor and regulating the menstrual cycle.

Abstract: Optically active and racemic prostaglandin derivatives of the formula ##STR1## wherein R.sub.1 is --OR.sub.5 ; --NHSO.sub.2 CH.sub.3 ; or --O--CH.sub.2 --U--V; R.sub.5 is hydrogen, alkyl, aryl, or a heterocyclic group; U is a direct bond, carbonyl or carbonyloxy; and V is phenyl substituted by 1-3 phenyl, alkoxy of 1-2 carbon atoms, or halogen, preferably bromine;R.sub.2 is hydrogen or alkyl of 1-5 carbon atoms;R.sub.3 is alkyl, substituted or unsubstituted cycloalkyl, straight-chain or branched alkyl of 1-5 carbon atoms substituted by aryl or substituted aryl, when R.sub.1 is as above; or R.sub.3 is aryl or substituted aryl group when R.sub.1 is --OR.sub.5 ', --NHSO.sub.2 CH.sub.3, or --O--CH.sub.2 --U--V and R.sub.5 ' is aryl or a heterocyclic group and U and V are as above;R.sub.4 is hydrogen or an ether or acyl residue;A is --CH.sub.2 --CH.sub.2 -- or cis--CH.dbd.CH--;B is --CH.sub.2 --CH.sub.2 -- or trans--CH.dbd.CH--;D is a direct bond, oxygen, or sulfur;Z is carbonyl or >CH OR.sub.4 wherein OR.sub.