A solution of 15.3 g of crude 3-acetoxy-16-bromo-11-(5-chloropentyl)-estra-1,3,5(10)-trien-17-one in 237 ml of pyridine is mixed with 79 ml of water and then with 50 ml of sodium hydroxide solution (1N) and stirred for 24 hours at room temperature. Then, 25 ml of hydrochloric acid (2N) is added, it is evaporated to the dry state in a vacuum, diluted with 11 of ethyl acetate, washed with hydrochloric acid (2N), washed neutral with water, washed with common salt solution, dried on sodium sulfate and evaporated to the dry state in a vacuum. 4.2 g of crude 11-(5-chloropentyl)-3,16-dihydroxy-estra-1,3,5(10)-trien-17-one is obtained, and after chromatography on silica gel with hexane/ethyl acetate, 2.5 g of pure 11-(5-chloropentyl)-3,16-dihydroxy-estra-1,3,5(10)-trien-17-one is obtained.
