反应详情

温度

80 °C

Thionyl chloride (35.8 grams, 0.305 mole) was added to a benzene solution of 2-chloro-4-nitrobenzoic acid (60.3 grams, 0.3 mole) and the mixture heated to reflux during 5 hours until the evolution of hydrogen chloride had ceased. Aluminum chloride (100 grams, 0.72 mole) was added slowly to the stirred solution during a 3.5 hour period and the temperature rose to 48° C. After the addition, the mixture was warmed to 80° C. for 2 hours, cooled, poured onto ice-water (one liter), concentrated hydrochloric acid (90 ml.) added and the mixture warmed at 40° C. for 3 hours. Benzene extraction followed by successive treatment with 5% aqueous sodium hydroxide, water and calcium chloride yielded, after removal of benzene, a reddish black residue purified by filtration. The pale yellow solid so obtained was further characterized as having a melting point equal to 95.5° C.-96.5° C. in 44% yields.

1. temperaturethe mixture heated
2. customrose to 48° C
3. additionAfter the addition
4. temperaturecooled
5. additionadded
6. temperaturethe mixture warmed at 40° C. for 3 hours
7. extractionBenzene extraction
8. customyielded
9. customafter removal of benzene
10. filtrationa reddish black residue purified by filtration
11. customThe pale yellow solid so obtained
12. customequal to 95.5° C.-96.5° C.
13. customyields