[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>CN(C)C=O.C(OCC)(=O)C.C1(C)C=CC=CC=1>[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-dichlorophenyl-ethenyl)-2-(1-propylmercaptocyclopropyl)-oxirane in 30 ml of dimethylformamide is added dropwise at 80° C. under a nitrogen atmosphere and with stirring to a mixture of 24 g (0.35 mol) of 1,2,4-triazole, 2.7 g (0.02 mol) of potassium tert.-butylate and 50 ml of dimethylformamide. The mixture is stirred for 6 hours at 80° C., then the solvent is stripped off under reduced pressure, and the residue is taken up in ethyl acetate/toluene, washed using water, dried over sodium sulphate and concentrated under reduced pressure. The residue remaining is chromatographed on silica gel using chloroform as 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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