Benzene → 4-Bromobutyric acid

Temperature

60 °C

In this Example, 8.35 g of 4-bromobutyric acid (50 mmol) was dissolved in 10 g of benzene (128mmol) and, after the temperature was raised to 60° C., 3.43 g of phosphorus trichloride (24 mmol) was dropwise added. Thereafter, the mixture was stirred at that temperature for one hour. Then, after the mixture was cooled to 20° C., the reaction solution was dropwise added into a suspension solution of 20 g containing benzene (256 mmol) and 6.7 g of aluminum chloride (50 mmol) at 10° C. After stirring the mixture at that temperature for one hour, the temperature was raised to 20° C. and the mixture was further stirred for 30 minutes and added into a 10% aqueous solution of hydrochloric acid that had been cooled to 10° C. Then, the aqueous phase was extracted with benzene, and the organic phase was washed with diluted hydrochloric acid, an aqueous solution of sodium hydrogencarbonate, and brine, followed by removing the solvent by distillation under reduced pressure to give 4-bromobutyrophenone in a 73.9% yield from 4-bromobutyric acid.

1. temperatureThen, after the mixture was cooled to 20° C.
2. additionthe reaction solution was dropwise added into a suspension solution of 20 g
3. stirringAfter stirring the mixture at that temperature for one hour
4. temperaturethe temperature was raised to 20° C.
5. stirringthe mixture was further stirred for 30 minutes
6. temperaturehad been cooled to 10° C
7. extractionThen, the aqueous phase was extracted with benzene
8. washthe organic phase was washed with diluted hydrochloric acid
9. customby removing the solvent
10. distillationby distillation under reduced pressure

ORD record

ord-d473406404a44733a9c0fd83134ded4a

Source dataset

uspto-grants-2000_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06037509