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500 mg of 19-methylthio-4-androstene-3,17-dione (European patent 100,566) is added to a suspension of 5.21 g of chloromethyl triphenylphosphonium chloride in 50 ml of tetrahydrofuran, which was stirred with 9.5 ml of (1.6 m of butyllithium in ether) 0.5 hours at 20° C., and stirred for 30 minutes at 0° C. Then it is mixed with water, extracted three times with ethyl acetate, washed neutral, dried on sodium sulfate and concentrated to dryness. 995 mg of raw product is obtained, which after chromatographic purification yields 273 mg of pure 3-chloromethylene-19-methylthio-4-androsten-17-one with a melting point of 114°-115° C., [α]D +241.5° C. (CHCl3), as pure E form.

1. extractionextracted three times with ethyl acetate
2. washwashed neutral
3. customdried on sodium sulfate
4. concentrationconcentrated to dryness
5. custom995 mg of raw product is obtained
6. customwhich after chromatographic purification