Kermessic acid

Structural formula
General
Surname	Kermessic acid
other names	3,5,6,8-tetrahydroxy-1-methyl-9,10-dioxo-9,10-dihydro-2-anthracenecarboxylic acid ( IUPAC ); Kermesic acid; 3,5,6,8-tetrahydroxy-1-methyl-anthraquinone-2-carboxylic acid; CI 75460; CI Natural Red 3;
Molecular formula	C 16 H 10 O 8
Brief description	red needles
External identifiers / databases
PubChem	11727234
ChemSpider	9901950
Wikidata	Q27162385
properties
Molar mass	330.25 g mol −1
Physical state	firmly
Melting point	320 ° C (dec.)
safety instructions
H and P phrases	H: 315-319-335
	P: 261-280-302-352-305-351-338
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Kermesic ( Kermesinsäure ) is an anthraquinone derivative and the main component of the red dye Kermes ( spurious Carmine ). The compound is the aglycon of carminic acid , the main component of real carmine .

Occurrence and use

Scale insects Kermes ilicis

Kermess acid, like carminic acid or laccainic acids , is an insect pigment obtained from scale insects. It is the only colored compound contained in the Kermes.

The chemical structure of kermess acid was elucidated in 1916 by Otto Dimroth .

Individual evidence

↑ ^a ^b Entry on Kermessäure. In: Römpp Online . Georg Thieme Verlag, accessed on November 23, 2018.
↑ ^a ^b Entry on Kermesic Acid at Toronto Research Chemicals , accessed on March 4, 2019 ( PDF ).
↑ Mark C. Whiting: The dyes in early oriental carpets . In: Society of German Chemists (ed.): Chemistry in our time . 15th year, no. 6 . Verlag Chemie GmbH, Weinheim 1981, p. 179-189 .
↑ Perey Brigl: The chemical research into natural dyes . Springer Fachmedien, Wiesbaden 1921, ISBN 978-3-663-03907-5 , p. 43 ff ., doi : 10.1007 / 978-3-663-05096-4 ( limited preview in the Google book search).
↑ Otto Dimroth, Reinhold Fick: About the dye of the kermes . In: Justus Liebig's Annals of Chemistry . tape 411 , no. 3 , 1916, p. 315-338 , doi : 10.1002 / jlac.19164110303 .

[Roempp-1] Entry on Kermessäure. In: Römpp Online . Georg Thieme Verlag, accessed on November 23, 2018.

[TRC-2] Entry on Kermesic Acid at Toronto Research Chemicals , accessed on March 4, 2019 ( PDF ).

[CHIUZ-3] Mark C. Whiting: The dyes in early oriental carpets . In: Society of German Chemists (ed.): Chemistry in our time . 15th year, no. 6 . Verlag Chemie GmbH, Weinheim 1981, p. 179-189 .

[Brigl-4] Perey Brigl: The chemical research into natural dyes . Springer Fachmedien, Wiesbaden 1921, ISBN 978-3-663-03907-5 , p. 43 ff ., doi : 10.1007 / 978-3-663-05096-4 ( limited preview in the Google book search).

[5] Otto Dimroth, Reinhold Fick: About the dye of the kermes . In: Justus Liebig's Annals of Chemistry . tape 411 , no. 3 , 1916, p. 315-338 , doi : 10.1002 / jlac.19164110303 .