2-Trifluoromethylphenol → o-Cresol, 4-bromo-alpha,alpha,alpha-trifluoro-

First, 41.33 g of 2-trifluoromethylphenol and 1800 ml of chloroform were charged into a reaction vessel, and 129.16 g of tetra-n-butylammonium tribromide was slowly added at room temperature over about one hour with stirring. After stirring at room temperature for 72 hours, the reaction solution was concentrated. Then, 500 ml of 10% hydrochloric acid was added to the resultant residue, and the mixture was extracted four times with 200 ml of diethyl ether. The ether layers were combined, washed with water, dried over anhydrous magnesium sulfate and then concentrated to give 49.5 g of 4-bromo-2-trifluoromethylphenol as a crude product (yield, 81%).

1. stirringAfter stirring at room temperature for 72 hours
2. concentrationthe reaction solution was concentrated
3. additionThen, 500 ml of 10% hydrochloric acid was added to the resultant residue
4. extractionthe mixture was extracted four times with 200 ml of diethyl ether
5. washwashed with water
6. dry with materialdried over anhydrous magnesium sulfate
7. concentrationconcentrated

ORD record

ord-e1ee1295b0254c1ab1bf68fc081b7ffe

Source dataset

uspto-grants-1997_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05698702