Picolinic acid

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Picolinic acid
Picolinic acid.svg
Picolinic-acid-3D-balls.png
Names
IUPAC name
pyridine-2-carboxylic acid
Identifiers
98-98-6 YesY
ChEBI CHEBI:28747 YesY
ChEMBL ChEMBL72628 YesY
ChemSpider 993 YesY
Jmol-3D images Image
PubChem 1018
Properties
C6H5NO2
Molar mass 123.11 g·mol−1
Appearance White to tan crystalline solid
Melting point 136 to 138 °C (277 to 280 °F; 409 to 411 K)
887 g/L[1]
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Picolinic acid is an organic compound with the formula C5H4N(CO2H). It is a derivative of pyridine with a carboxylic acid substituent at the 2-position. It is an isomer of nicotinic acid, which has the carboxyl side chain at the 3-position. It is a white solid that is soluble in water.

In synthetic organic chemistry, has been used as a substrate in the Mitsunobu reaction and in the Hammick reaction.[2]:495ff

Coordination chemistry[edit]

Picolinic acid is a bidentate chelating agent of elements such as chromium, zinc, manganese, copper, iron, and molybdenum in the human body.[1]:72 Many of its complexes are charge-neutral and thus lipophilic. After its role in absorption was discovered, zinc dipicolinate dietary supplements became popular as they were shown to be an effective means of introducing zinc into the body.[3]

Biosynthesis[edit]

Picolinic acid is a catabolite of the amino acid tryptophan through the kynurenine pathway.[1][4]

It is a precursor to the coenzyme NAD+.[3] In addition, it is suggested to assist in the absorption of zinc (II) ions and other divalent or trivalent ions through the small intestine.[5]

See also[edit]

References[edit]

  1. ^ a b c Grant, RS; Coggan, SE; Smythe, GA (2009). "The physiological action of picolinic Acid in the human brain.". International journal of tryptophan research : IJTR 2: 71–9. PMC 3195224. PMID 22084583. Retrieved 22 January 2013. 
  2. ^ Picolinic Acid chapter in Philip L. Fuchs. Handbook of Reagents for Organic Synthesis: Catalytic Oxidation Reagents. John Wiley & Sons, Jul 29, 2013 ISBN 9781118704820
  3. ^ a b Grant, R.; Coggan, S.; Smythe, G. (2009). "The Physiological Action of Picolinic Acid in the Human Brain". International Journal of Tryptophan Research (Libertas Academica) 2: 71–79. Retrieved 20 March 2015. 
  4. ^ Tan L et al. The kynurenine pathway in neurodegenerative diseases: mechanistic and therapeutic considerations. J Neurol Sci. 2012 Dec 15;323(1-2):1-8. PMID 22939820
  5. ^ Evans, Gary (1982). "The Role of Picolinic Acid in Metal Metabolism". Life Chemistry Reports (Harwood Academic Publishers) 1: 57–67. Retrieved 20 March 2015.