11 .beta.-(4-isopropenylphenyl)-estra-4,9-dienes of general Formula I ##STR1## wherein X is an oxygen atom or a hydroxyimino grouping N OH, R.sup.1 is a hydrogen atom or a methyl group, R.sup.2 is a hydrogen atom or an acyl residue of 1-10 carbon atoms, R.sup.3 is a hydrogen atom, the cyanomethyl group, --(CH.sub.2).sub.n --, CH.sub.2 Z, --CH.dbd.CH--(CH.sub.2).sub.m Z or --C.tbd.C--Y wherein n=0 to 5 and m=1 to 4, Z meaning a hydrogen atom or the OR.sup.4 group with R.sup.4 meaning a hydrogen atom, an alkyl or alkanoyl group each of 1-4 carbon atoms, and Y meaning a hydrogen, chlorine, fluorine, iodine or bromine atom, an alkyl, hydroxyalkyl, alkoxyalkyl or acyloxyalkyl group each of 1-4 carbon atoms in the alkyl or acyl residue, possess antiprogestational activity.
11.β-(4-异
丙烯基苯基)-
雌甾-4,9-二烯的通用式I ##STR1## 其中X是氧原子或羟
亚胺基团NOH,R^1是氢原子或甲基,R^2是1-10个碳原子的酰残基或氢原子,R^3是氢原子、
氰甲基基团、--(
CH2)n--、 Z、--CH=CH--( )mZ或--C≡C--Y,其中n=0至5,m=1至4,Z表示氢原子或OR^4基团,R^4表示氢原子、1-4个碳原子的烷基或烷酰基,Y表示氢、
氯、
氟、
碘或
溴原子,烷基、羟基烷基、烷氧基烷基或酰氧基烷基,每个烷基或酰基残基中含有1-4个碳原子,具有抗孕激素活性。