[NH2:1][CH2:2][C:3]1[CH:11]=[CH:10][C:6]([C:7]([OH:9])=[O:8])=[CH:5][CH:4]=1.[C:12]([O-])(=[O:14])[CH3:13].[Na+].O>C(O)(=O)C>[C:12]([NH:1][CH2:2][C:3]1[CH:4]=[CH:5][C:6]([C:7]([OH:9])=[O:8])=[CH:10][CH:11]=1)(=[O:14])[CH3:13]A mixture of 4-aminomethylbenzoic acid (Aldrich, 1.51 g, 0.01 mol) and anhydrous sodium acetate (1.5 g, 0.018 mol) in glacial acetic acid (5 mL) was heated at reflux for 18 h. On cooling, the mixture was poured into cold water (50 mL). The precipitate was separated by filtration and washed several times with cold water. The cake was recrystallized from water to give 1.4 g (72.5%) of the title compound as a white powder, mp 195° C.
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