C[O:2][C:3]1[CH:15]=[CH:14][CH:13]=[C:12]([O:16]C)[C:4]=1[C:5]([CH2:7][CH2:8][C:9]([OH:11])=[O:10])=[O:6].B(Br)(Br)Br>>[OH:2][C:3]1[CH:15]=[CH:14][CH:13]=[C:12]([OH:16])[C:4]=1[C:5]([CH2:7][CH2:8][C:9]([OH:11])=[O:10])=[O:6]3-(2,6-Dimethoxybenzoyl)propionic acid was demethylated with boron tribromide according to the general procedure of Example 22(i) to give 3-(2,6-dihydroxybenzoyl)propionic acid.
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