[CH3:1][O:2][C:3]([C:5]1([S:8][C:9]2[CH:14]=[C:13]([NH2:15])[C:12]([F:16])=[CH:11][C:10]=2[Cl:17])[CH2:7][CH2:6]1)=[O:4].C(=O)([O-])[O-].[Ca+2].[C:23](Cl)(Cl)=[S:24]>C(Cl)CCl.O>[CH3:1][O:2][C:3]([C:5]1([S:8][C:9]2[CH:14]=[C:13]([N:15]=[C:23]=[S:24])[C:12]([F:16])=[CH:11][C:10]=2[Cl:17])[CH2:7][CH2:6]1)=[O:4]While stirring at room temperature, a solution of 5.5 g of 1-(5-amino-2-chloro-4-fluoro-phenylthio)-cyclopropanecarboxylic acid methyl ester in 20 ml of ethylene chloride is added dropwise to a mixture of 3 g of calcium carbonate, 2 ml of thiophosgene in 20 ml of ethylene chloride and 20 ml of water. After stirring for 4 hours at room temperature, the inorganic portion of the reaction mixture is filtered off and the organic phase is dried over calcium chloride and then concentrated by evaporation, yielding 6.3 g of 1-(2-chloro-4-fluoro-5-isothiocyanato-phenylthio)-cyclopropanecarboxylic acid methyl ester having a melting point of from +100° to +101° C.
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