[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[CH:9]=[CH:10][C:11]1([C:14]2([S:17][CH2:18][CH2:19][CH3:20])[CH2:16][CH2:15]2)[CH2:13][O:12]1.[NH:21]1[CH:25]=[N:24][CH:23]=[N:22]1.CC(C)([O-])C.[K+]>CN(C)C=O>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1/[CH:9]=[CH:10]/[C:11]([C:14]1([S:17][CH2:18][CH2:19][CH3:20])[CH2:16][CH2:15]1)([OH:12])[CH2:13][N:21]1[CH:25]=[N:24][CH:23]=[N:22]1A solution of 38.2 g (0.12 mol) of 2-(2,4-dichlorophenylethenyl)-2-(1-propylmercaptocyclopropyl) oxirane in 30 ml of dimethylformamide is added dropwise under a nitrogen atmosphere and with stirring at 80° C. to a mixture of 24 g (0.35 mol) of 1,2,4-triazole, 2.7 g (0.02 mol) of potassium tert.-butoxide and 50 ml of dimethylformamide. The mixture is stirred at 80° C. for 6 hours, then the solvent is removed under reduced pressure, and the residue is taken up in ethyl acetate/toluene, washed with water, dried over sodium sulphate and concentrated under reduced pressure. The residue which remains is chromatographed on silica gel using chloroform as the eluant. In this manner, 12.1 g (26% of theory) of trans-4-(2,4-dichlorophenyl)-2-(1-propylmercaptocyclopropyl)1-(1,2,4-triazol-1-yl)-but-3-en-2-ol are obtained in the form of an oily product.
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