Boron tribromide → 3-Bromo-2,5-dichlorophenol

Participants

Reaction Steps

Boron tribromide as a 1 M solution in dichloromethane (41 mL, 41 mmol) was added to 1-bromo-2,5-dichloro-3-methoxybenzene (10.5 g, 41 mmol) in dichloromethane (100 mL) at −78° C. under N2. The reaction mixture was allowed to warm to room temperature, and after 21 hours, the mixture was poured into 100 g of ice, diluted with 100 g of water, and the organic layer separated. The aqueous layer was extracted with dichloromethane (200 mL) and the combined organic extracts were dried (MgSO4), filtered and the solvent was evaporated under reduced pressure. 1H NMR (CDCl3) δ 7.20 (m, 1H), 7.00 (m, 1H), 5.70 (s, 1H).

Provenance & Evidence