3,5-Diethylphenol → 4-Bromo-3,5-diethylphenol

To a solution of 3,5-diethylphenol (9.30 g, 61.9 mmol) in methanol (100 mL) was added tetrabutylammonium tribromide (29.8 g, 61.9 mmol), and the mixture was stirred at room temperature for 15 hr. The solvent was evaporated under reduced pressure, water was added to the residue, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=0:100-25:75), and the obtained crystals were recrystallized from heptane to give the title compound (1.85 g) as colorless crystals. The mother liquor was concentrated under reduced pressure to give the title compound (8.68 g) as dark-brown crystals (total 10.5 g, total yield 74%).

1. customThe solvent was evaporated under reduced pressure, water
2. additionwas added to the residue
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (ethyl acetate:hexane=0:100-25:75)
8. customthe obtained crystals were recrystallized from heptane

ORDレコード

ord-ea3d2f6560fe46db880239bac14eaf5d

出典データセット

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07732626B2