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Unformatted text preview: transfer HO OH O O NH 2 HO CO 2 H HO HO OH O O NH 2 + CO 2 H OH HO H 2 O CO 2 H CO 2 H O OH O O NH 3 O O NH 3 H heat, decarboxylation final product from this point is an arrow-pushing mechanism for acid-mediated hydrolysis of a phthalimide I'm not showing it, but this reaction is undoubtedly aided by the presence of carboxylic acid groups that can protonate intramolecularly . Indeed, the final cleavage step may well happen intramolecularly to give phthalic anhydride, which would then be ring-opened by water to give the dicarboxylic acid byproduct shown....
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