Sodium Hydroxide → 4-Bromo-1-(bromomethyl)-2-chlorobenzene

Temperature

0 °C

Phosphorus tribromide (40.5 mL, 0.431 mol) was added dropwise to a solution of (4-bromo-2-chlorophenyl)-methanol (15, 86.1 g, 0.386 mol) in dichloroethane (430 mL) at 0° C. The reaction mixture was stirred for 10 minutes at this temperature then for 0.5 h at 10° C. The mixture was cooled to 0° C. and a sodium hydroxide solution (600 mL, 2N) was added dropwise. The two layers were separated and the aqueous layer was extracted with dichloroethane (200 mL). The combined organic layers were washed with water (200 mL), dried over sodium sulfate and evaporated in vacuo. The crude product (91 g) was distilled under reduced pressure (7 mmHg), to give 4-bromo-1-bromomethyl-2-chlorobenzene (62.5 g, 0.22 mol, 57%) as a colorless oil.

1. waitfor 0.5 h at 10° C
2. customThe two layers were separated
3. extractionthe aqueous layer was extracted with dichloroethane (200 mL)
4. washThe combined organic layers were washed with water (200 mL)
5. dry with materialdried over sodium sulfate
6. customevaporated in vacuo
7. distillationThe crude product (91 g) was distilled under reduced pressure (7 mmHg)

ORD record

ord-8155a02b54e04993ba6d92382f244303

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08372970B2