2-(2,4-Dichlorophenoxy)ethanol → 1-(2-Bromoethoxy)-2,4-dichlorobenzene

To a solution of 2-(2,4-dichlorophenoxy)-1-ethanol (10.0 g) in 1,2-dimethoxyethane (200 mL) was added dropwise a solution of phosphorous tribromide (14 g) in 1,2-dimethoxyethane (20 mL) under ice-cooling. The reaction solution was stirred at room temperature for 20 hours. After the reaction solution was concentrated, the residue was diluted with water and ethyl acetate. When saturated aqueous sodium hydrogencarbonate solution was added to the organic layer, an emulsion was formed, which was filtered through Celite. The filtrate was diluted with diethyl ether and saturated aqueous ammonium chloride solution. The organic layer was dried over anhydrous magnesium sulfate and then concentrated. The residue was purified by silica gel column chromatography to yield the title compound as a pale yellow oil (6.15 g).

1. temperaturecooling
2. concentrationAfter the reaction solution was concentrated
3. additionthe residue was diluted with water and ethyl acetate
4. additionWhen saturated aqueous sodium hydrogencarbonate solution was added to the organic layer
5. customan emulsion was formed
6. filtrationwhich was filtered through Celite
7. additionThe filtrate was diluted with diethyl ether and saturated aqueous ammonium chloride solution
8. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
9. concentrationconcentrated
10. customThe residue was purified by silica gel column chromatography

ORD-Eintrag

ord-3371fa653d8e4d32a42f51bbd53dbfd7

Quelldatensatz

uspto-grants-2007_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07253178B2