benzene-1,2-dicarboxylic acid⟶230 °C2-benzofuran-1,3-dionewaterReverse reactions2-benzofuran-1,3-dione + water → benzene-1,2-dicarboxylic acidPotentially competing2-benzofuran-1,3-dione + water → benzene-1,2-dicarboxylic acidLessonsReactions of Acid AnhydridesCarboxylic Acids