Br[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH:5]=[C:4]([C:12]([OH:14])=[O:13])[C:3]=1[OH:15].BrBr>>[OH:15][C:3]1[C:4]([C:12]([OH:14])=[O:13])=[CH:5][C:6]2[C:11](=[CH:10][CH:9]=[CH:8][CH:7]=2)[CH:2]=1A similar procedure is used to prepare 1-bromo-2-hydroxy-3-naphthoic acid except that bromine is used instead of chlorine.
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