Water → 2-Acetamido-6-methylbenzoic acid

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A suspension of 15.2 g (100 mmoles) of 6-methyl-2-aminobenzoic acid (obtained from the Aldrich Chemical Company, Inc., Milwaukee Wis.) in 150 mL of glacial acetic acid was heated in a water bath to promote homogeneity. Acetic anhydride, 15 mL (159 mmole), was added and the resultant solution kept in the hot water bath for 40 minutes. Upon cooling to near room temperature, the dark solution was poured over crushed ice. When all ice had melted, the pale beige solid which had separated was collected and air-dried. 16.4 g (85% yield) 6-methyl-2-acetylaminobenzoic acid was obtained. NMR(DMSO-d6): 2.00(s,3H), 2.33(s,3H), 7.05(d,1H,J=7.5 Hz), 7.29(t,1H,J=7.8 Hz), 7.41(d,1H,J=7.8 Hz), 9.60(bs,1H). MS(m/z): 193(M+).

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