NOVELTY - Synthesizing norgestomet (I), comprises: e.g. (a) reacting 3,3-ethyelendioxy-5 alpha ,10 alpha -epoxy-17 alpha -(trimethylsilyloxy)-5 alpha -estr-9(11)-en-17 beta -carbonitril (II) with methyl magnesium chloride in presence of copper(I) chloride in an ether type solvent at a temperature of not greater than 15 degrees C; and (b) reacting obtained 3,3-ethylendioxy-11 beta -methyl-5 alpha -hydroxy-17 alpha -(trimethylsilyloxy)-estr-9-en-17 beta -carbonitrile (III) with trimethylsilyl chloride in the presence of a tertiary amine in an ether type or halogenated solvent at a temperature of not greater than 40 degrees C.    USE - The process is useful for preparing norgestomet (claimed), which is useful for synchronizing reproductive cycles to increase the fertilization rate in animals. No biological data given.    ADVANTAGE - The process: is simple, reliable and realizable on industrial scale; provides (I) with high purity and yield; avoids the use of environmentally harmful and flammable agents; utilizes (V), which can be used for reaction without further purification; and decreases the formation of byproducts.    DETAILED DESCRIPTION - Synthesizing norgestomet of formula (I), comprises: (a) reacting 3,3-ethyelendioxy-5 alpha ,10 alpha -epoxy-17 alpha -(trimethylsilyloxy)-5 alpha -estr-9(11)-en-17 beta -carbonitril of formula (II) with methyl magnesium chloride in presence of copper(I) chloride in an ether type solvent at a temperature of not greater than 15 degrees C; (b) reacting obtained 3,3-ethylendioxy-11 beta -methyl-5 alpha -hydroxy-17 alpha -(trimethylsilyloxy)-estr-9-en-17 beta -carbonitrile of formula (III) with trimethylsilyl chloride in the presence of a tertiary amine in an ether type or halogenated solvent at a temperature of not greater than 40 degrees C; (c) reducing obtained 3,3-ethylendioxy-11 beta -methyl-5 alpha ,17 alpha -bis(trimethylsilyloxy)-estr-9-en-17 beta -carbonitrile of formula (IV) with an excess amount of diisobutylaluminum hydride in an ether type solvent at a temperature of not greater than 0 degrees C; (d) reacting obtained 3,3-ethylendioxy-11 beta -methyl-5 alpha ,17 alpha -bis(trimethylsilyloxy)-estr-9-en-17 beta -carbaldehyde of formula (V) without further purification with methyl magnesium chloride to furnish 20-hydroxy-pregnane derivative, and removing protective groups by addition of aqueous potassium bisulfate solution while keeping the temperature below 30 degrees C; (e) reducing obtained (11 beta ,17 alpha ,20 epsilon )-11-methyl-norpregna-4,9-dien-17,20-diol of formula (VI) with lithium in liquid ammonia in a mixture of tetrahydrofuran and an apolar solvent at a temperature of not greater than -33 degrees C; and either (f) oxidizing hydroxy group in a position 20 of obtained (11 beta ,17 alpha ,20 epsilon )-11-methyl-norpregn-5(10)-en-17,20-diol-3-one of formula (VII) with at least three equivalent of dimethyl sulfoxide/oxalyl chloride reagent mixture in dichloromethane while keeping the temperature below -40 degrees C, continuing the oxidation at a temperature of not greater than 0 degrees C after adding not more than three equivalent of trialkyl amine, acetylating obtained (11 beta ,17 alpha )-17-hydroxy-11-methyl-norpregn-5(10)-en-3,20-dione of formula (VIII) with acetic anhydride in dichloromethane in the presence of perchloric acid at a temperature of not greater than 0 degrees C, and finally isomerizing obtained (11 beta ,17 alpha )-17-acetoxy-11-methyl-norpregn-5(10)-en-3,20-dione of formula (IX) with hydrochloric acid in methanol at a reflux temperature to furnish (I), or (g) isomerizing double bond in a position 5(10) of (VII) with hydrochloric acid in methanol at a reflux temperature, oxidizing the hydroxy group in a position 20 of obtained (11 beta ,17 alpha ,20 epsilon )-11-methyl-norpregn-4-en-17,20-diol-3-one of formula (VIIIa) with at least three equivalent of dimethyl sulfoxide/oxalyl chloride reagent mixture in dichloromethane while keeping the temperature below 40?Oc, continuing the oxidation at a temperature of not greater than 0 degrees C after adding not more than three equivalent of trialkyl amine, and finally acetylating obtained (11 beta ,17 alpha )-17-hydroxy-11-methyl-norpregn-4-en-3,20-dione of formula (IXa) with acetic anhydride in a halogenated solvent in the presence of perchloric acid at a temperature of not greater than 0 degrees C to furnish (I). INDEPENDENT CLAIMS are also included for the compounds (III), (IV), (V), (VI), (VII), (VIII), (VIIIa) and (IX)