4,7-Dihydroxyflavanone

R= OH, Products 2, 4, 6, 4-tetrahydro5 chalcone 5,7,4 -trihydro) avanone R= H, Products 2, 4, 4-trihydroxychalcone 7,4 -dihydroxyflavanone, which requires operation of reductase E1... 

Dihydroxyflavanone Liquiritigenin Root exudate Medicago saliva S. meliloli... 

FIGURE 9.3 The hydrogen bond network in the (5 -4, 7-dihydroxyflavanone-chalcone isomerase complex. (Adapted from Jez, J.M., Bowman, M.E., and Noel, J.P., Biochemistry, 41, 5168, 2002. With permission.)... 

Loureirin B (= 4 -Hydroxy-2,4,6-trimethoxy-dihydrochalcone) (dihydrochalcone) Loureirin D (=4, 4,6-Trihydroxy-2-methoxy-dihydrochalcone) (dihydrochalcone) Liquiritigenin (=7,4 -Dihydroxyflavanone) (flavanone)... 

Analyses of two crystalline forms of naphthazarin indicate that the molecular structure may be interpreted in terms of the resonance forms (33), with the phenolic hydrogen atom involved in non-symmetrical intramolecular hydrogen bonding. Similar hydrogen bonding is a feature both of obtusifolin (34), which has an almost planar dihydroxyflavanone ring... 

Colourless to pale yellow flavanones are widespread in foods, but are not important as food pigments. At higher concentrations they are found only in citrus fruits. The main components are glycosides derived from (2S)-5,7-dihydroxyflavanones, which differ in substituents of the ring C (9-89 and 9-90). 

Soya beans contain isoflavone daidzein (7,4 -dihydroxyiso-flavone), which is the most active oestrogenic isoflavone, accompanied by genistein (5,7,4 -trihydroxyisoflavone), formonone-tin (7-hydroxy-4 -methoxyisoflavone), glycitein (7,4 -dihydroxy-6-methoxyisoflavone) and biochanin A (5,7-dihydroxy-4 -methoxyisoflavone, 10-95). The biochemical precursor of daidzein, formononetin and glycitein is flavanone Kquiritigenin (7,4 -dihydroxyflavanone), the precursor of genistein and biochanin A is naringenin (5,7,4 -trihydroxyflavanone). 

Also obtained by peroxidatic degradation of 7,4 -dihydroxyflavanone or 7,4 -dihydroxy-3 -methoxyflavanone [5078],... 

Dihydroxyflavanone (Pinocembrin) Adiantum sulphureum Klf. Notholaena limitanea var. mexicana Broun C15H12O4 121 125 ... 

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