反应详情

温度

25 °C

89.3 g of 3-chloro-5-trifluoromethyl-2-pyridinecarboxylic acid (Example H3) are slowly heated to reflux temperature together with 60 ml of thionyl chloride and the mixture is then subsequently stirred at this temperature for 4 hours. Thereafter, it is cooled to 25° C. and concentrated to dryness in vacuo. Toluene is added twice more and the mixture is concentrated again to dryness. 94.0 g of the desired product are obtained as a yellow residue.

1. concentrationconcentrated to dryness in vacuo
2. additionToluene is added twice more
3. concentrationthe mixture is concentrated again to dryness