Carbon Dioxide → 5-Bromo-2,3,4-trifluorobenzoic acid

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To a solution of 1-bromo-2,3,4-trifluorobenzene (1) (5.0 mL, 41.7 mmol) in THF (120 mL) was added LiHMDS (2.0 M solution, 21 mL, 42 mmol) at −78° C. After stirring for 1 hour at −78° C., the mixture was added to a solution of CO2 in THF (1 L). The dry-ice bath was removed and the reaction mixture stirred overnight at room temperature. The reaction mixture was quenched with 10% aqueous HCl (835 mL), concentrated, and washed with ether (250 mL). The combined organics were washed with 5% aqueous NaOH (300 mL) and water (100 mL). The aqueous layer was acidified (pH 0) with concentrated HCl. The resulting suspension was extracted with ether (2×300 mL), dried over MgSO4, filtered, concentrated under reduced pressure to afford 7.70 g (72% yield) of the desired product (2).

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