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With thionyl chloride; In toluene; at 50 - 80℃; for 3h;
In a 250 ml four-necked flask equipped with a reflux condenser, a thermometer and a dropping funnel, 30.0 g (0.157 mol) of 4-(trifluoromethyl)nicotinic acid, 100 ml of toluene, heated to 50-60 C, and dripped 28.0 g (0.235 mol) of thionyl chloride was added, and the addition was completed in about 1 hour. After the dropwise addition was completed, the temperature was raised to 80 C for 2 hours, and the reaction was completed to obtain a 4-(trifluoromethyl)nicotinyl chloride solution.