[BH4-].[Na+].[Cl:3][C:4]1[CH:9]=[CH:8][C:7]([S:10][CH2:11][C:12]([CH3:22])([CH3:21])[C:13](=[O:20])[CH2:14][N:15]2[CH:19]=[CH:18][N:17]=[CH:16]2)=[CH:6][CH:5]=1.BrCC(=O)C(C)(C)CSC1C=CC(Cl)=CC=1>O>[Cl:3][C:4]1[CH:9]=[CH:8][C:7]([S:10][CH2:11][C:12]([CH3:22])([CH3:21])[CH:13]([OH:20])[CH2:14][N:15]2[CH:19]=[CH:18][N:17]=[CH:16]2)=[CH:6][CH:5]=10.3 g (0.0079 mol) of sodium borohydride in 8 ml of water was added dropwise to 7 g (0.024 mol) of 4-(4-chlorophenylmercapto)-3,3-dimethyl-1-(imidazol-1-yl)-butan-2-one, compound 6 of Example 6 hereinabove, at room temperature. The reaction mixture was subsequently stirred at room temperature for 1 hour and was poured onto water. The crystals which had precipitated were filtered off, and dried at 50° C. in vacuo. 6.5 g (91% of theory) of 4-(4-chlorophenylmercapto)-3,3-dimethyl-1-(imidazol-1-yl)-butan-2-ol of melting point 109°-110° C. were obtained.
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