New methodology for preparing of novel insecticide fipronil

2,6-Dichloro-4-trifluoromethylaniline is a key intermediate of synthesising fipronil.Synthesis of 2,6-dichloro-4-trifluoromethylaniline through materials such as 4-trifluoromethylaniline,sulfuric chloride,chloroform,and etc,was studied.The optimum conditions was that the mole ratio of 4-trifluoromethylaniline to sulfurychloride was 1∶3.5,reacted 4 h.The total yield was 84.3%.