Hydrogen Peroxide → 2-Fluoro-5-methoxyphenol

To a 200 ml THF solution containing 50.1 g of 1-fluoro-4-methoxybenzene and 70 g of N,N,N′,N′,N″-pentamethyldiethylenetriamine there was added dropwise 150 ml of n-butyllithium (2.66 M, hexane solution) over a period of 30 minutes, at −74° C. under a nitrogen atmosphere. After stirring for 3 hours at between −74° C. and −70° C., 100 ml of trimethyl borate was added. The temperature of the reaction mixture was then slowly allowed to rise to room temperature. Next, 70 ml of acetic acid and 75 ml of 30% aqueous hydrogen peroxide were added, and the reaction mixture was stirred overnight at room temperature. Water was then added to the reaction mixture, and then it was extracted with a mixture of hexane and ethyl acetate and dried over anhydrous magnesium sulfate. The desiccating agent was filtered off, and the filtrate was concentrated under reduced pressure to give a crude product of 1-fluoro-2-hydroxy-4-methoxybenzene (65.59 g) as a white solid.

1. customat −74° C.
2. customto rise to room temperature
3. stirringthe reaction mixture was stirred overnight at room temperature
4. extractionit was extracted with a mixture of hexane and ethyl acetate
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationThe desiccating agent was filtered off
7. concentrationthe filtrate was concentrated under reduced pressure

ORD-Eintrag

ord-ffc72892b9d84e258167541a9c0795d9

Quelldatensatz

uspto-grants-2010_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07816522B2