Br[CH2:2][C:3](=[O:16])[C:4]([CH3:15])([CH3:14])[CH2:5][S:6][C:7]1[CH:12]=[CH:11][C:10]([Cl:13])=[CH:9][CH:8]=1.[NH:17]1[CH:21]=[CH:20][N:19]=[CH:18]1.C(=O)([O-])[O-].[K+].[K+]>CC(C)=O>[Cl:13][C:10]1[CH:11]=[CH:12][C:7]([S:6][CH2:5][C:4]([CH3:15])([CH3:14])[C:3](=[O:16])[CH2:2][N:17]2[CH:21]=[CH:20][N:19]=[CH:18]2)=[CH:8][CH:9]=1199 g (0.618 mol) of 1-bromo-4-(4-chlorophenylsulphenyl)-3,3-dimethylbutan-2-one, 120 g (1.76 mols) of imidazole and 243.5 g (1.76 mols) of potassium carbonate in 3 liters of acetone are stirred under reflux for 5 hours. The mixture is then allowed to cool, the inorganic salts are filtered off with suction, and the filtrate is concentrated. The residue is taken up in methylene chloride, washed three times with water, dried over sodium sulphate, and concentrated. Recrystallizing from diisopropyl ether produces 156 g (82% of theory) of 4-(4-chlorophenylsulphenyl)-3,3-dimethyl-1-(imidazol-1-yl)-butan-2-one having a melting point of 50° C. ##STR118##
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