Isonicotinic acid

Isonicotinic acid or 4-pyridinecarboxylic acid is an organic compound with the formula C5H4N(CO2H). It is a derivative of pyridine with a carboxylic acid substituent at the 4-position. It is an isomer of picolinic acid and nicotinic acid which has the carboxyl group at the 2- and 3-position respectively compared to the 4-position for isonicotinic acid.

Isonicotinic acid[1]
Skeletal formula
Ball-and-stick model
Names
Preferred IUPAC name
Pyridine-4-carboxylic acid
Other names
Isonicotinic acid
4-Pyridinecarboxylic acid
p-Pyridinecarboxylic acid
4-Picolinic acid
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.000.208
KEGG
UNII
Properties
C6H5NO2
Molar mass 123.111 g·mol−1
Appearance White to off-white crystalline solid
Density Solid
Melting point 310 °C (590 °F; 583 K) (sublimes)
Hazards
Safety data sheet http://datasheets.scbt.com/sc-250188.pdf
NFPA 704 (fire diamond)
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
3
0
Related compounds
Related compounds
 nicotinic acid, pyridine isoniazid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Derivatives

Isonicotinic acids derived drugs include isoniazid, iproniazid, nialamide, ethionamide and dexamethasone isonicotinate.

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See also

References
  1. Isonicotinic acid at chemicalland21.com
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