Thiophosgene → 1-(2-Chloro-4-fluoro-5-isothiocyanato-phenylthio)-cyclopropanecarboxylic acid methyl ester

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Reaction Steps

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.

Provenance & Evidence