25982-03-0Relevant articles and documents
MECHANISM OF QUERCETIN OXYGENATION A POSSIBLE MODEL FOR HAEM DEGRADATION
Rajananda, V.,Brown, Stanley B.
, p. 4331 - 4334 (1981)
Quercetin undergoes base-catalysed oxidative decarbonylation by a mechanism involving only one oxygen molecule, unlike the apperently similar step in haem catabolism, which requires two oxygen molecules.
Flavonoid oxidation by the radical generator AIBN: a unified mechanism for quercetin radical scavenging.
Krishnamachari, Venkat,Levine, Lanfang H,Pare, Paul W
, p. 4357 - 4363 (2002)
Four oxidized flavonoid derivatives generated from reacting quercetin (a pentahydroxylated flavone) with the peroxyl radical generator 2,2'-azobis-isobutyronitrile (AIBN) were isolated by chromatographic methods and identified by NMR and MS analyses. Comp
Radical-capturing reaction of 5,7,3′,4′-tetramethylquercetin with the AIBN radical initiator
Ishikawa, Takahiro,Takagi, Michiyo,Kanou, Mamiko,Kawai, Shingo,Ohashi, Hideo
, p. 173 - 177 (2007/10/03)
In order to clarify the mechanism for the radical-capturing reaction which is initiated at the C3-hydroxyl group of flavonols, 5,7,3′,4′-tetramethylquercetin (TMQ) was reacted with the 2,2′-azobis-isobutyronitrile (AIBN) radical initiator in benzene. Six products, one depside and its two hydrolytic products, one nitrite adduct, and two others, were isolated from the reaction mixture, and their structures were determined by instrumental analyses. The quantitative change to the four main products against the reaction time was measured by an HPLC method. The radical-capturing reaction pathway for TMQ with AIBN is proposed from these products and their quantitative changes. The pathway dividing into two clearly reveals that one subpath formed the depside and its hydrolytic products, while the other formed the nitrite adduct. The reactivity of each two sub-path was nearly the same, different from the case of TMQ and the 2,2′-azobis-2,4-dimethylvaleronitrile (AMVN) radical initiator.