Pyridinecarboxylic acids

Pyridinecarboxylic acids
Surname	Picolinic acid	Nicotinic acid	Isonicotinic acid
other names	Pyridine-2-carboxylic acid	Pyridine-3-carboxylic acid	Pyridine-4-carboxylic acid
Structural formula
CAS number	98-98-6	59-67-6	55-22-1
PubChem	1018	938	5922
Molecular formula	C 6 H 5 NO 2
Molar mass	123.11 g mol −1
Physical state	firmly
Melting point	134-137 ° C	236.6 ° C	315-319 ° C
GHS labeling	Caution	Caution	Caution
H and P phrases	302-319	319	319
	no EUH phrases	no EUH phrases	no EUH phrases
	305 + 351 + 338	305 + 351 + 338	260-262-305 + 351 + 338

In chemistry, pyridinecarboxylic acids form a group of organic compounds that belong to the heterocycles (more precisely: heteroaromatic compounds ). They consist of a pyridine ring that is substituted with a carboxy group  (−COOH). Their different arrangement results in three constitutional isomers with the empirical formula C ₆ H ₅ NO ₂ . They are mainly known by their common names picolinic acid , nicotinic acid and isonicotinic acid . They can be obtained from the picolines by oxidation of the methyl group z. B. using potassium permanganate (KMnO ₄ ).

See also

• Pyridinedicarboxylic acids
• Pyridine tricarboxylic acids

Individual evidence

1. ↑ ^{a b} Entry on picolinic acid in the GESTIS substance database of the IFA , accessed on October 14, 2012(JavaScript required) .
2. ↑ ^{a b} Entry on nicotinic acid in the GESTIS substance database of the IFA , accessed on June 17, 2011(JavaScript required) .
3. ↑ ^{a b} Entry on isonicotinic acid in the GESTIS substance database of the IFA , accessed on June 17, 2011(JavaScript required) .
4. ↑ Harold Hart (author), Leslie E. Craine (author), David J. Hart (author), Christopher M. Hadad (author); Nicole Kindler (translator): Organic Chemistry , 3rd edition, Wiley-VCH, Weinheim 2007, ISBN 978-3-527-31801-8 , p. 494.