Hydrochloric Acid → 3-Chloro-1-(4-methylphenyl)propan-1-one

Aluminum chloride (480 g) was suspended in methylene chloride (1125 mL). Nitromethane (195 mL) was added dropwise to the suspension and the resulting mixture was stirred for one hour at room temperature. Subsequently, toluene (321 mL) was added dropwise thereto and the mixture was stirred for one hour at room temperature. Further, to the mixture was added dropwise 3-chloropropionylchloride (289 mL) at 10-15° C. and the resultant mixture was stirred for 2 hours at room temperature. After the reaction mixture was cooled in an ice bath, ice, then methylene chloride, water, and concentrated hydrochloric acid were added to the mixture with stirring. The layers were separated, and the organic layer was washed sequentially with 1N hydrochloric acid, saturated sodium bicarbonate, and saturated brine, and dried over anhydrous sodium sulfate, after which the solvent was evaporated under reduced pressure. The residue was recrystallized from a solvent mixture of hexane and ethyl acetate, to thereby obtain 457.9 g of the target compound as white crystals. Melting point: 77.5-78.5° C.

1. stirringthe mixture was stirred for one hour at room temperature
2. temperatureAfter the reaction mixture was cooled in an ice bath
3. stirringwith stirring
4. customThe layers were separated
5. washthe organic layer was washed sequentially with 1N hydrochloric acid, saturated sodium bicarbonate, and saturated brine
6. dry with materialdried over anhydrous sodium sulfate
7. customafter which the solvent was evaporated under reduced pressure
8. customThe residue was recrystallized from a solvent mixture of hexane and ethyl acetate

ORD record

ord-0aae73b31cdd4021a76359bcb3eba05e

Source dataset

uspto-grants-2002_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06395739B1