Hydrochloric Acid → Benzene, 1-chloro-4,5-difluoro-2-(trichloromethyl)-

Into a 200 ml four-necked flask equipped with a stirrer, a reflux condenser, a thermometer and a dropping funnel, 97 ml (1 mol) of carbon tetrachloride and 26.7 g (0.2 mol) of aluminum chloride were charged, and 14.9 g (0.1 mol) of 1-chloro-3,4-difluorobenzene was gradually dropwise added over a period of 1.5 hours under reflux so that hydrochloride gas was slowly generated. The generated hydrochloride gas was absorbed by an aqueous sodium hydroxide solution. After completion of the dropwise addition, the mixture was reacted for 10 minutes. After cooling to room temperature, the reaction mixture was poured into 300 ml of ice water. The organic layer was separated and washed with 100 ml of water, then with 100 ml of 5% of sodium hydrogen carbonate aqueous solution and further with 100 ml of water. After distilling off carbon tetrachloride, the residue was distilled under reduced pressure to obtain 17.4 g (yield: 65.4%) of 2-chloro-4,5-difluorobenzotrichloride. Boiling point: 104°-106° C./8 mmHg, nD20 1.540; purity: 98.2%

1. customInto a 200 ml four-necked flask equipped with a stirrer, a reflux condenser
2. customThe generated hydrochloride gas was absorbed by an aqueous sodium hydroxide solution
3. additionAfter completion of the dropwise addition
4. customthe mixture was reacted for 10 minutes
5. customThe organic layer was separated
6. washwashed with 100 ml of water
7. distillationAfter distilling off carbon tetrachloride
8. distillationthe residue was distilled under reduced pressure

ORD 기록

ord-16082e8045c84423829df8eadd22a4eb

출처 데이터셋

uspto-grants-1993_08

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US05241111