反应详情

Into a mixture of ethyl [2-(5-amino-2-chloro-4-fluorophenoxy)phenoxy]acetate [Intermediate compound A3-23], trichloromethyl chloroformate and toluene is added dropwise activated carbon, and the mixture is heated under reflux. The reaction solution is filtrated and the solvent is distilled off to obtain 4-chloro-2-fluoro-5-{2-(ethoxycarbonylmethoxy)phenoxy}phenyl isocyanate [Intermediate compound A12-23].

1. additionis added dropwise activated carbon
2. temperaturethe mixture is heated
3. temperatureunder reflux
4. filtrationThe reaction solution is filtrated
5. distillationthe solvent is distilled off