A process for preparing polyhalogenated perfluoroalkylanilines particularly useful as reaction intermediates for preparing agrochemicals is disclosed The process comprises reacting anhydrous monomethylamine with 3,4-dichlorobenzotπfluoπde at a temperature of 140-200 °C, halogenating the resultant intermediate with halogenating agents like chloride, sulfuryl chloride and PC15, and then dealkylating the deactivated aniline with catalytic quantity of pyridine salt and dry HC1 gas at 180-190 °C or with anhydrous hydrobromic acid to get 2,6-dichloro-4-trifluoromethylaniline.
本发明揭示了一种制备多卤代
全氟烷基
苯胺的方法,特别适用于制备农药的反应
中间体。该方法包括将无
水单
甲胺与3,4-二
氯苯并三
氟苯反应,在140-200°C的温度下用
氯化物、
磺酰氯和
PCl5等卤化剂卤代所得的
中间体,然后使用催化量的
吡啶盐和干燥的HC1气体在180-190°C下去烷基化失活的
苯胺,或者使用无
水溴酸将其去烷基化,得到
2,6-二氯-4-三氟甲基苯胺。