Peracetic Acid → 3-Bromo-6-chloro-2-fluorophenol

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A solution of 1-bromo-4-chloro-2-fluorobenzene (20.4 g, 0.100 mol) in tetrahydrofuran (THF; 50 mL) was slowly added to lithium diisopropylamide (LDA; 0.125 mol) in THF (600 mL) at −50° C. After addition, the solution was warmed to −20° C. and then cooled to −50° C. A solution of trimethyl borate (13.5 g, 0.130 mol) in THF (20 mL) was added slowly and the temperature was warmed to −20° C. The mixture was then cooled to −70° C. and a solution of peracetic acid (32% in acetic acid, 0.150 mol) was slowly added and the mixture was warmed to ambient temperature. Water (250 mL) was added and the solution was extracted with ethyl acetate (2×200 mL). The combined organic phases were dried and concentrated. The black oil was purified by column chromatography (20% ethyl acetate in hexanes) to give 3-bromo-6-chloro-2-fluorophenol (14.1 g, 0.063 mol) 1H NMR (CDCl3): δ 7.05 (m, 2H), 5.5 (br s, 1H).

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