Showing papers on "Flavanone published in 1976"
TL;DR: The present results suggest that naringenin is the only natural product of the synthase reaction and that further substitution in the B-ring of the flavonoids occurs in parsley at or after the flavanone stage.
89 citations
TL;DR: Only UV light below 345 nm stimulates anthocyanin formation in dark grown cell suspension cultures of Haplopappus gracilis, andastic increases in the activities of the enzymes phenylalanine ammonia-lyase, chalcone isomerase and flavanone synthase were observed under continuous UV light.
73 citations
TL;DR: In this paper, new compounds were isolated from the root of Glycyrrhiza glabra L. (Leguminosae) and named glabridin and glabrol, whose structures were determined to be an isoflavan (I) and a flavanone (VI) respectively.
Abstract: New compounds were isolated from the root of Glycyrrhiza glabra L. (Leguminosae) and named glabridin and glabrol, whose structures were determined to be an isoflavan (I) and a flavanone (VI), respectively.
55 citations
TL;DR: In a cross between a yellow-seeded variety, Abu Taiman, and a white-seeding variety, CK 60, the F1 produced red seeds, which produced the red anthocyanidins, luteolinidin and apigeninidin.
Abstract: In a cross between a yellow-seeded variety, Abu Taiman, and a white-seeded variety, CK 60, the F1 produced red seeds. The yellow pigment in Abu Taiman was tentatively identified as erodictyol chalcone, and the red seeds, when heated with mineral acid, produced the red anthocyanidins, luteolinidin and apigeninidin. Pericarp colour in the cross studied, appeared to be controlled by two independent factors, denoted by Y and R. While Y was a basic gene for the synthesis of the flavonoid skeleton, gene R appeared to control the reduction of the flavanone (eriodictyol) into its corresponding pentahydroxyflavan (luteoforol) from which the red anthocyanidin luteolinidin, was produced. A pathway for the biosynthesis of luteolinidin has been suggested.
38 citations
TL;DR: From the leaves of Garcinia dulcis(Roxb) Kurz a series of biflavanoids were isolated and methylation of a minor component gave the novel I-4′,I- 5,II-5, I-7, II-7-pentamethoxyflavanone[I-3,II,8]chromone.
Abstract: From the leaves of Garcinia dulcis(Roxb) Kurz a series of biflavanoids were isolated. Morelloflavone was characterised as its heptamethyl ether; it forms an octa-acetate by ring opening of ring I-C. GB-2a forms an octamethyl ether having a naringenin unit linked to a chalcone. By methylation, volkensiflavone and amentoflavone were isolated (as their hexamethyl ethers); methylation of a minor component gave the novel I-4′,I-5,II-5,I-7,II-7-pentamethoxyflavanone[I-3,II-8]chromone.
31 citations
13 citations
TL;DR: In this article, a mixture of flavanone hydrazones with active manganese dioxide was given, and the mixture contained the azines and the flavanones, respectively.
Abstract: Oxidation of flavanone hydrazones(I) with active manganese dioxide gave a mixture of flavanones(II) and the azines(III).
11 citations
6 citations
Patent•
01 Mar 1976TL;DR: In this paper, a method for preparing a 3-deoxy-5-hydroxyanthocyanidin salt having a 4' and/or 7 OH substituent from a corresponding acylated flavanone is presented.
Abstract: Method for preparing a 3-deoxy-5-hydroxyanthocyanidin salt having a 4' and/or 7 OH substituent from a corresponding acylated flavanone, by (1) reducing the acylated flavanone in a solvent medium by reaction with an alkali borohydride to form a corresponding flavan not having an OH substituent at the 4 position, and (2) oxidizing the flavan or an acylated or hydrolyzed derivative of the flavan in an organic solvent medium by reaction with a halogenated benzoquinone in the presence of a strong acid and water. Suitable acylated flavanones include acetylated natural flavanones, especially acetylated naringenin and hesperetin.
6 citations
TL;DR: In this article, it was shown that photolysis of 7,8-benzoflavanone in 2-propanol led to the cleavage of the pyrone ring instead of the formation of coupling products.
Abstract: Photolyses of flavanone and substituted flavanones in benzene led to the cleavage of the pyrone ring to give corresponding 2′-hydroxychalcones, while similar irradiation of flavanone or 4-chromanone in 2-propanol gave coupling products (pinacols and solvent adducts). However, photolysis of 7,8-benzoflavanone in 2-propanol led to the cleavage of the pyrone ring instead of the formation of coupling products. It is implied that the cleavage of the pyrone ring takes place via π-π* triplet states, while formation of coupling products via n-π* triplet states.
5 citations
TL;DR: A constituent of the seeds of Amorpha fruticosa, hitherto unknown, was identified as 5, 7-dihydroxy-6-geranyl flavanone, on the basis of its chemical and spectroscopic properties as mentioned in this paper.
Abstract: Ein bisher unbekannter Inhaltsstoff der Samen von Amorpha fruticosa (Papilionaceae) konnte aufgrund seiner spektralen und chemischen Eigenschaften als 5, 7-Dihydroxy-6-geranyl-flavanon identifiziert werden.
A Flavanone with an Isoprenoid C10-Side Chain Isolated from Amorpha Fruticosa Seeds
A constituent of the seeds of Amorpha fruticosa, hitherto unknown. was identified as 5, 7-dihydroxy-6-geranyl flavanone, on the basis of its chemical and spectroscopic properties.
Patent•
23 Mar 1976
TL;DR: In this article, a lower alkyl of from one to three carbon atoms inclusive, n is an integer of from 1 to 3 inclusive and M is hydrogen or a physiologically acceptable metal cation, are disclosed.
Abstract: Flavanones represented by the formula ##STR1## wherein R is a lower alkyl of from one to three carbon atoms inclusive, n is an integer of from one to three inclusive and M is hydrogen or a physiologically acceptable metal cation, are disclosed. These materials are themselves useful as dietetic sweeteners as well as being direct intermediates for the preparation of useful dihydrochalcone sweeteners.
TL;DR: In this article, the 2′-hydroxychalcone with hydrazoic acid in trifluoroacetic acid gave flavanone, 2,3-dihydro-2-phenyl-1,4-benzoxazepin-5(4H)-one and isoflavone.
Abstract: Treatment of 2′-hydroxychalcone with hydrazoic acid in trifluoroacetic acid gave flavanone, 2,3-dihydro-2-phenyl-1,4-benzoxazepin-5(4H)-one, 2-styrylbenzoxazole, (±)-trans-3-aminoflavanone, and isoflavone. The mechanism of the reaction is discussed.