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0 °C

A solution containing 0.34 gram (0.006 mole) of potassium hydroxide and 0.109 gram (0.006 mole) of water in 80 milliliters of ethanol was prepared in a 250 milliliter round bottom flask. With cooling to a temperature of 0° C. in an ice/NaCl bath and stirring, a solution of ethyl 1-(2-methyl-4,5-dichlorophenylaminocarbonyl)cyclopropanecarboxylate prepared in Example III in a small volume of ethanol was added and the mixture allowed to stir with warming to room temperature over a 72 hour period. The mixture was vacuum evaporated to give a white solid residue which was dissolved in water and extracted twice with ether. The ether extracts were discarded. The water solution was acidified to a pH of 2 with 25% HCl solution causing separation of a solid which was taken up into ether, and the acidified aqueous phase was extracted four times. The combined ether extracts were dried over magnesium sulfate and vacuum evaporated to give a white solid. This white solid was water-washed and dried in a vacuum oven to give 1.85 grams (0.006 mole) of 1-(2-methyl-4,5dichlorophenylaminocarbonyl)cyclopropanecarboxylic acid having a melting point of 248° C.-251° C. Elemental analysis of the product indicated the following:

1. customwas prepared in a 250 milliliter round bottom flask
2. stirringto stir
3. temperaturewith warming to room temperature over a 72 hour period
4. customevaporated
5. customto give a white solid residue which
6. extractionextracted twice with ether
7. customseparation of a solid which
8. extractionthe acidified aqueous phase was extracted four times
9. dry with materialThe combined ether extracts were dried over magnesium sulfate and vacuum
10. customevaporated
11. customto give a white solid
12. washwashed
13. customdried in a vacuum oven