Azalein (flavonoid)

Structural formula
General
Surname	Azalein
other names	2- (3,4-Dihydroxyphenyl) -7-hydroxy-5-methoxy-3- (rhamnoside) -4 H -chromen-4-one
Molecular formula	C 22 H 22 O 11
Brief description	pale yellow needles,
External identifiers / databases
PubChem	5321320
ChemSpider	26286942
Wikidata	Q413011
properties
Molar mass	462.41 g · mol -1
Physical state	firmly
Melting point	181-185 ° C (pentahydrate)
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Azalein is a flavonoid . It is the 3- O - α -L-rhamnoside of azaleatine (2- (3,4-dihydroxyphenyl) -3,7-dihydroxy-5-methoxy-4 H -chromen-4-one, quercetin-5- methyl ether) and thus a glycoside .

Occurrence

Flavonol-3-rhamnoside is part of the flower colors of rhododendrons . It was described by Harborne and Egger in 1962.

The aglycon is also known as azaleatine (529-51-1; MW 316.27, MP 322 ° C, 252 & 368 nm, brilliant yellow needles).

Structural formula of azaleatine

Individual evidence

↑ ^a ^b Jurd, L. et al, J. Org. Chem. , 1957, 22 , 1618. doi : 10.1021 / jo01363a022
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ R. Hegnauer, Chemotaxonomie Der Pflanzen , Vol. 4 , ISBN 978-3-7643-0167-5
^ John Buckingham, Dictionary of Natural Products , 5505

[Jurd-1] Jurd, L. et al, J. Org. Chem. , 1957, 22 , 1618. doi : 10.1021 / jo01363a022

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Pflanzen-3] R. Hegnauer, Chemotaxonomie Der Pflanzen , Vol. 4 , ISBN 978-3-7643-0167-5

[DONP-4] John Buckingham, Dictionary of Natural Products , 5505