Coumalic Acid
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Coumalic acid is an
organic compound Some chemical authorities define an organic compound as a chemical compound that contains a carbon–hydrogen or carbon–carbon bond; others consider an organic compound to be any chemical compound that contains carbon. For example, carbon-co ...
with the molecular formula C6H4O4. Its melting point is around 210 °C. In laboratory coumalic acid may be obtained by self-condensation of
malic acid Malic acid is an organic compound with the molecular formula . It is a dicarboxylic acid that is made by all living organisms, contributes to the sour taste of fruits, and is used as a food additive. Malic acid has two stereoisomeric forms ( ...
in fuming sulfuric acid:


References

{{Reflist 2-Pyrones Carboxylic acids