Rhodizonic acid

Structural formula
General
Surname	Rhodizonic acid
other names	2,3,5,5,6,6-hexahydroxy-2-cyclohexene-1,4-dione 5,6-dihydroxycyclohex-5-en-1,2,3,4-tetron ( IUPAC )
Molecular formula	C 6 H 2 O 6
Brief description	dark orange, needle-shaped crystals
External identifiers / databases
EC number	204-276-5
ECHA InfoCard	100,003,888
PubChem	67050
Wikidata	Q2823301
properties
Molar mass	170.08 g mol −1
Physical state	firmly
Melting point	decomposes at 130–140 ° C
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Rhodizonic acid is a chemical compound from the group of oxo carbons .

history

Rhodizonic acid was discovered by Johann Florian Heller in 1837 when he analyzed the products of the joint heating of potassium carbonate and charcoal.

Extraction and presentation

Rhodizonic acid can be prepared by oxidation of myo -inositol or by trimerization of glyoxal in the presence of cyanide are recovered as the catalyst.

use

Rhodizonic acid can be used to detect sulfate by titration with a barium chloride standard solution with the addition of the metal indicator rhodizonic acid sodium salt. Barium and strontium give reddish precipitations with rhodizonic acid or its sodium salt.

Individual evidence

↑ ^a ^b ^c Entry on rhodizonic acid. In: Römpp Online . Georg Thieme Verlag, accessed on March 10, 2016.
↑ ^a ^b Data sheet rhodizonic acid from AlfaAesar, accessed on March 10, 2016 ( PDF )(JavaScript required) .
↑ Joh. Florian Heller: Rhodizonic acid, a new acid obtained from the products of potassium preparation, and its chemical relationships . In: Annals of Pharmacy . tape 24 , no. 1 , January 1837, p. 1-17 , doi : 10.1002 / jlac.18370240102 .
^ Paul W. Preisler, Louis Berger: Preparation of Tetrahydroxyquinone and Rhodizonic Acid Salts from the Product of the Oxidation of Inositol with Nitric Acid . In: Journal of the American Chemical Society . tape 64 , no. 1 , 1942, p. 67-69 , doi : 10.1021 / ja01253a016 .
↑ Rolf Pohling: Chemical reactions in water analysis . Springer-Verlag, 2015, ISBN 978-3-642-36354-2 , pp. 329 ( limited preview in Google Book search).
^ PH List, L. Hörhammer: Hager's handbook of pharmaceutical practice . General part. Active ingredient groups I. Springer-Verlag, 1967, ISBN 978-3-642-47985-4 , p. 234 ( limited preview in Google Book search).

[roempp-1] Entry on rhodizonic acid. In: Römpp Online . Georg Thieme Verlag, accessed on March 10, 2016.

[Alfa-2] Data sheet rhodizonic acid from AlfaAesar, accessed on March 10, 2016 ( PDF )(JavaScript required) .

[3] Joh. Florian Heller: Rhodizonic acid, a new acid obtained from the products of potassium preparation, and its chemical relationships . In: Annals of Pharmacy . tape 24 , no. 1 , January 1837, p. 1-17 , doi : 10.1002 / jlac.18370240102 .

[4] Paul W. Preisler, Louis Berger: Preparation of Tetrahydroxyquinone and Rhodizonic Acid Salts from the Product of the Oxidation of Inositol with Nitric Acid . In: Journal of the American Chemical Society . tape 64 , no. 1 , 1942, p. 67-69 , doi : 10.1021 / ja01253a016 .

[Rolf_Pohling-5] Rolf Pohling: Chemical reactions in water analysis . Springer-Verlag, 2015, ISBN 978-3-642-36354-2 , pp. 329 ( limited preview in Google Book search).

[Hagers-6] PH List, L. Hörhammer: Hager's handbook of pharmaceutical practice . General part. Active ingredient groups I. Springer-Verlag, 1967, ISBN 978-3-642-47985-4 , p. 234 ( limited preview in Google Book search).