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2,6-Dichloro-3-nitroquinoline was prepared by heating a mixture of 6-chloro-3-nitroquinoline-1-oxide and phosphorous oxychloride under reflux. The product was isolated as a nearly colourless crystalline solid, mp 190° C. Mass spectrum (m/e): 242 (parent ion; 90%); 196 (100%).

1. temperatureby heating
2. temperatureunder reflux
3. customThe product was isolated as a nearly colourless crystalline solid, mp 190° C