Nitric Acid → 3-Nitro-2,5,6-trichlorobenzoic acid

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2,3,6-Trichlorobenzoic acid (20.84 g, 92.4 mmol, prepared by the method of M. T. Goebel, U.S. Pat. No. 3,391,185, E.I. DuPont, Jul. 2, 1968) was stirred at 40°-45° C. in 89.1 mL of concentrated sulfuric acid. A solution containing 23.2 g of concentrated sulfuric acid and 23.2 g of fuming nitric acid was added at a rate so to maintain the temperature between 40°-45° C. An additional 20 mL of concentrated sulfuric acid was added. The reaction mixture was stirred at 43° C. for 1.5 hours and then poured over ice water. The resulting crystals were filtered and recrystallized from toluene-hexane to give 23.40 g (94%) of product; mp 149°-151° C.

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