反应详情

A water-jacketed glass column of 2.7 cm inner diameter is packed with a suspension of 50.0 g of basic alumina (sold by Shokubai Kasei Kogyo Co. Ltd. under trade name of ACBR-3, calcined at a temperature above 500° C. and pulverized to about 50 mesh) in 100 ml of 1,2-dichloroethane (to a depth of 13.0 cm) and water is passed through the jacket so as to set the temperature at 20° C. In 1400 ml of 1,2-dichloroethane, 20.00 g of crude 19-norethisterone of 91.8% purity which results from ethynylation of 19-norandrost-4-ene-3,17-dione and which contains 1.7% ethynylestradiol in addition to other impurities is dissolved at 20° C. and the resulting solution is introduced on the top of the column at a linear velocity of 2 m/hr using a feed pump. The 1,2-dichloroethane solution passed through the alumina is received in an Erlenmeyer flask. After the solution of 19-norethisterone in 1,2-dichloroethan has been passed, 500 ml of 1,2-dichloroethane is further passed through the alumina to wash it. The two liquids are combined and concentrated to dryness at reduced pressure with 1,2-dichloroethane being distilled off.

1. customcalcined at a temperature above 500° C.
2. customat 20° C