Dinicotinic acid explained

Dinicotinic acid (pyridine-3,5-dicarboxylic acid) is a heterocyclic organic compound, more precisely a heteroaromatic. It is one of many pyridinedicarboxylic acids and consists of a pyridine ring carrying to carboxy groups in the 3- and 5-positions.

Preparation and properties

Dinicotinic acid can be formed by heating pyridine-2,3,5,6-tetracarboxylic acid or carbodinicotinic acid (pyridine-2,3,5-tricarboxylic acid).^{[1] [2]}

The acid is sparingly soluble in water and ether. Its melting point of 323 °C is the highest among pyridinedicarboxylic acids. Upon heating, it decarboxylates and decomposes to nicotinic acid:^[3]

See also

• Dipicolinic acid, an isomeric dicarboxylic acid

Notes and References

1. Meyer . Hans . Tropsch . Hans . 1914 . Über Dinicotinsäure und deren Abbau zu ββ′-Diaminopyridin und über das αα′-Diaminopyridin . Monatshefte für Chemie . de . 35 . 2 . 207–217 . 10.1007/BF01518124 . 0026-9247.
2. Book: Wolffenstein, Richard . Die Pflanzenalkaloide . 1922 . 978-3-642-92449-1 . Dritte, verbesserte und vermehrte Auflage . Berlin, Heidelberg . 67 . de . 913710178.
3. Philippine Journal of Science . 109 . 1–2 . 19–21 . 1980 . Preparation of some nicotinic acid derivatives . Alam, Mahbub . Khan, M. Hafeez .