We report the reaction of gallic acid with chloroacetic acid and three
equivalents of sodium hydroxide. In this reaction, 2,6-dihydroxy-4-ca
rboxyphenoxyacetic acid (A) is produced instead of 2,3-dihydroxy-5-car
boxyphenoxyacetic acid (B), previously informed(1)). The structure of
(A) was established by C-13-NMR and also confirmed through XH CORR and
COLOC bidimensional techniques, performed on the diisobutylester.