CSC.S([O:9][CH3:10])(OC)(=O)=O.[CH2:11]([S:14][C:15]1([C:18]([CH:20]=[CH:21][C:22]2[CH:27]=[CH:26][C:25]([Cl:28])=[CH:24][C:23]=2[Cl:29])=O)[CH2:17][CH2:16]1)[CH2:12][CH3:13].[OH-].[K+].OO>C(O)(C)(C)C>[Cl:29][C:23]1[CH:24]=[C:25]([Cl:28])[CH:26]=[CH:27][C:22]=1[CH:21]=[CH:20][C:18]1([C:15]2([S:14][CH2:11][CH2:12][CH3:13])[CH2:16][CH2:17]2)[CH2:10][O:9]130 ml (0.41 mol) of dimethyl sulphide and 43.5 g (0.35 mol) of dimethyl sulphate are added to 60 ml of tert.-butanol and allowed to stand at room temperature for 14 hours. A solution of 40 g (0.13 mol) of 2,4-dichlorophenyl-ethenyl 1-propylmercaptocyclopropyl ketone in 120 ml of tert.-butanol is initially added dropwise to the reaction mixture with stirring and then 39.1 g of potassium hydroxide powder is introduced, the temperature of the reaction mixture being held at 20° to 30° C. The mixture is stirred for a further 3 hours at 30° C., then the dimethyl sulphide is stripped off under reduced pressure and the reaction mixture is then poured into 70 ml of a 1% strength aqueous hydrogen peroxide solution. The mixture is extracted with ethyl acetate. The organic phase is washed using water and concentrated by stripping off the solvent under reduced pressure after drying over sodium sulphate. In this manner, 38.2 g (91% of theory) of 2-(2,4-dichlorophenylethenyl)-2-(1-propylmercaptocyclopropyl)-oxirane are obtained in the form of an oily product, which is further reacted without additional purification. ##STR77##
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