Boron tribromide → 2-Hydroxy-5-(trifluoromethoxy)phenylboronic acid

Participants

Reaction Conditions

Reaction Steps

A suspension of 2-methoxy-5-(trifluoromethoxy)phenylboronic acid (23.0 g, 97.5 mmol) in dichloromethane (140 mL) was cooled to 0° C. and boron tribromide (9.4 mL, 10 mmol) was added drop-wise over 30 min. After stirring for 3 hours, additional boron tribromide (2 mL) was added. The reaction mixture was poured into ice water and stirred for 20 min. The dichloromethane was removed in vacuo and the white solid collected by filtration and washed with water before drying in vacuo to afford the title compound (20.8 g).

Provenance & Evidence