Hydrochloric Acid → Benzoic acid, 2-[(2-bromophenyl)thio]-5-nitro-

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2-Bromobenzenethiol (7.2 ml, 85.9 mmol) was added to a solution of KOH (9.6 g, 172 mmol) in water (50 ml) degassed for 15 minutes. 2-Fluoro-5-nitrobenzoic acid (15.9 g, 85.9 mmol) was added to the reaction mixture, which was refluxed under a nitrogen atmosphere overnight. The reaction was cooled to room temperature and was acidified (pH 1) with conc. HCl. The precipitate formed was filtered and dried overnight in a vacuum oven (50° C.) to give the crude title compound as a pale yellow solid (30 g, 99%). The product was used without further purification. m/z (LC-MS, ESP), RT=4.51min, (M−−1)=352-354, (1:1, bromine isotope ratio present).

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