反应详情

温度

20 °C

A solution of 220.1 g (1 mole) of N-chloromethylcarbamic acid 3-chlorophenyl ester in 1 liter of anhydrous ethyl acetate was added dropwise at 0° to 10° C to a mixture of 221 g (1 mole) of 2,4-dichlorophenoxyacetic acid and 111.3 g (1.1 moles) of triethylamine in 2 liters of ethyl acetate. The mixture was stirred for a further 15 hours at 20° C and was cooled to 5° C, and the triethylammonium chloride which had precipitated was filtered off. The filtrate was washed neutral with water and was concentrated in vacuo by distilling off the solvent. The solid residue was recrystallised from ether. 290 g (71.8% of theory) of 2-(2,4-dichlorophenoxy)-acetic acid 3-chlorophenoxycarbonylaminomethyl ester were obtained in the form of white crystals of melting point 110° C.

1. temperaturewas cooled to 5° C
2. customthe triethylammonium chloride which had precipitated
3. filtrationwas filtered off
4. washThe filtrate was washed neutral with water
5. concentrationwas concentrated in vacuo
6. distillationby distilling off the solvent
7. customThe solid residue was recrystallised from ether