Chlorine → 3,5-Dichloro-4-methylbenzoyl chloride

A jacketed kettle was equipped with a chiller, overhead stirrer, thermometer, and connections to a chlorine tank and a caustic scrubber. The kettle was charged with the previously prepared 3-chloro-4-methylbenzoyl chloride (1 part) and dichloromethane (6.8 parts). Aluminum trichloride (0.8 parts) was added, and the resulting red-brown mixture was cooled with agitation to 3°-5°--C. Chlorine (0.37 parts) was introduced at a sufficient rate to keep the reaction temperature below 10°--C. The reactor was held at 0°-5°--C. for 6 hours. The reaction mixture was purged with nitrogen and slowly quenched by transfering into an agitated and chilled hydrochloric acid solution (4.4 parts) while maintaining the temperature below 5°--C. Agitation was stopped and the lower organic layer was recovered. The solvent was removed by distillation.

1. customA jacketed kettle was equipped with a chiller, overhead stirrer
2. temperaturethe resulting red-brown mixture was cooled with agitation to 3°-5°
3. customthe reaction temperature below 10°
4. customwas held at 0°-5°
5. customThe reaction mixture was purged with nitrogen
6. customslowly quenched
7. temperaturechilled hydrochloric acid solution (4.4 parts)
8. temperaturewhile maintaining the temperature below 5°
9. customthe lower organic layer was recovered
10. customThe solvent was removed by distillation

ORD record

ord-f06ee4f180a84e8d9dbda840e80d8bb6

Source dataset

uspto-grants-1999_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05874466