tert-Butyl methyl ether → 4-Bromo-2-(bromomethyl)-1-chlorobenzene

To a solution of 2.08 g (9.39 mol) of 5-bromo-2-chlorobenzylalcohol in 30 ml of dry diethyl ether was added dropwise 1.27 g (4.23 mmol) of phosphorous tribromide with ice-cooling. The mixture was stirred with ice-cooling for 3 hours and stirred at room temperature for 1.5 hours. To the reaction solution were added ice water and then tert-butyl methyl ether. The mixture was stirred for 30 minutes and separated. The organic layer was washed successively with an about 5% aqueous solution of sodium bicarbonate and water, then dried and concentrated. The solid residue (1.99 g) was subjected to silica gel column chromatography (eluted with n-hexane) to obtain 1.88 g of 5-bromo-2-chlorobenzylbromide as flocculent crystals.

1. temperaturecooling
2. temperaturecooling for 3 hours
3. stirringstirred at room temperature for 1.5 hours
4. stirringThe mixture was stirred for 30 minutes
5. customseparated
6. washThe organic layer was washed successively with an about 5% aqueous solution of sodium bicarbonate and water
7. customdried
8. concentrationconcentrated
9. washThe solid residue (1.99 g) was subjected to silica gel column chromatography (eluted with n-hexane)

ORD record

ord-52763e9c490d4e37a18f758132707a05

Source dataset

uspto-grants-2002_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06489487B1