3-Amino-4-chlorobenzotrifluoride

Chemical Properties

Uses

Synthesis

328-84-7

39885-50-2

121-50-6

Example 1: N-methylpyrrolidone (1050 mL) was added to an autoclave with 102 g of anhydrous activated potassium fluoride followed by 377 g of 3,4-dichlorobenzotrifluoride. At ambient temperature, 158 g of ammonia was vented from a pressure tank into the reactor. The reaction mixture was heated to 245-250 °C over a period of 2 h, at which time the reactor pressure reached 30-32 kg/cm2. excess ammonia gas was continued to be passed from the pressure tank to maintain the reactor pressure at 38-40 kg/cm2 at a liquid temperature of 245-250 °C. The reaction was maintained at this temperature and pressure condition for 8 h. The reaction was completed with the addition of 377 g of potassium fluoride, followed by the addition of 377 g of 3,4-dichlorobenzotrifluoride. Upon completion of the reaction, the mixture was cooled to ambient temperature and the unreacted ammonia gas was drained and recovered. The reaction mixture was filtered and the products were separated by fractional distillation to give 2-chloro-4-trifluoromethylaniline (77% yield) and 2-chloro-5-trifluoromethylaniline (13% yield) based on 3,4-dichlorobenzotrifluoride consumption calculations.

References