[C:1]([C@:3]1([OH:23])[CH2:8][CH2:7][C@H:6]2[C:9]3[CH2:10][CH2:11][C:12]4[CH:13]=[C:14]([O:21][CH3:22])[CH:15]=[CH:16][C:17]=4[C:18]=3[CH2:19][CH2:20][C@:4]12[CH3:5])#[CH:2].C(=O)([O-])[O-].[Ca+2].[H][H]>C1C=CC=CC=1>[CH2:1]([C@:3]1([OH:23])[CH2:8][CH2:7][C@H:6]2[C:9]3[CH2:10][CH2:11][C:12]4[CH:13]=[C:14]([O:21][CH3:22])[CH:15]=[CH:16][C:17]=4[C:18]=3[CH2:19][CH2:20][C@:4]12[CH3:5])[CH3:2]Add dl-17α-ethynyl-3-methoxyestra-1,3,5(10),8-tetraen-17-ol (7 g) in benzene (75 ml) to a suspension of prehydrogenated 2% palladised calcium carbonate (3 g) in benzene (50 ml), and shake in an atmosphere of hydrogen until two molecular equivalents of hydrogen (1.030 ml) have been absorbed. Filter the catalyst, evaporate the solvent and recrystallize the residue twice from methanol to obtain dl-17α-ethyl-3-methoxyestra-1,3,5(10),8-tetraen-17-ol (4.5 g), m.p. 105°-120°; ultraviolet absorption maximum 278 mμ (ε12,000); infrared absorption peaks at 295 μ, 6.25 μ.
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