Pyridine tricarboxylic acids

In chemistry, the pyridine tricarboxylic 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 by three carboxy groups  (−COOH). Their different arrangement results in six constitutional isomers with the empirical formula C ₈ H ₅ NO ₆ .

The naming is usually done by prefixing them the syllable Carbo (for the additional carboxyl group) to the trivial name of pyridinedicarboxylic ( cinchomeronic , Isocinchomeronsäure , Dinicotinsäure , dipicolinic , Lutidinsäure ).

Pyridine tricarboxylic acids
Surname	Pyridine-2,3,4-tricarboxylic acid	Pyridine-2,3,5-tricarboxylic acid	Pyridine-2,3,6-tricarboxylic acid	Pyridine-2,4,5-tricarboxylic acid	Pyridine-2,4,6-tricarboxylic acid	Pyridine-3,4,5-tricarboxylic acid
other names	α-carbocinchomeronic acid	Carbodinicotinic acid	Carboisocinchomeronic acid carbodipicolinic acid	Berberonic acid	Collidinsäure Carbolutidinsäure trimesitinic	β-carbocinchomeronic acid
Structural formula
CAS number	632-95-1	116668-76-9		490-28-8	536-20-9	632-94-0
PubChem	17885103	17996040	17885101	10899899	345552	19377951
Molecular formula	C 8 H 5 NO 6
Molar mass	211.13 g mol −1
Physical state	firmly
Brief description	crystalline tablets	Needles	fine leaflets	Prisms	white needles	tabular leaflets
Melting point	249–250 ° C (decomposes to cinchomeronic acid )	323 ° C (decomposes to dinicotinic acid )	245–250 ° C (decomposes to isocinchomeronic acid )	235 ° C 243 ° C (decomposition)	227 ° C (decomposition)	261 ° C
GHS labeling	no classification available	no classification available	no classification available	no classification available	Caution	no classification available
H and P phrases	see above	see above	see above	see above	317-319	see above
	see above	see above	see above	see above	no EUH phrases	see above
	see above	see above	see above	see above	280-305 + 351 + 338	see above

See also

• Pyridinecarboxylic acids
• Pyridinedicarboxylic acids

Individual evidence

1. ↑ ^{a b c d e f g h i j k l m n o p q r} Richard Wolffenstein : Die Pflanzenalkaloide , 3rd edition, Berlin 1922, pp. 69–72 ( limited preview in the Google book search).
2. ↑ ^{a b c d e f g h} Johannes Leopold Meyer : Analysis and Constitution Determination of Organic Compounds , 4th edition, Berlin 1922, pp. 597-598 ( limited preview in the Google book search).
3. ↑ B. Chatterjee: Donor properties of pyridine carboxylic acids: chromium (III) complexes , in: Journal of Inorganic and Nuclear Chemistry , Volume 43, No. 10, 1981, pp. 2553-2555; doi: 10.1016 / 0022-1902 (81) 80300-4 .
4. ^ Raymond L. Richards: Vanadium: Inorganic & Coordination Chemistry , in: Encyclopedia of Inorganic and Bioinorganic Chemistry , 2011; doi: 10.1002 / 9781119951438.eibc0236 .
5. ↑ Matrix Scientific: MSDS pyridine-2,4,6-tricarboxylic acid