Showing papers on "Flavanone published in 1968"
TL;DR: Parallel competitive feeding experiments have been carried out in which either (a) 14 C-isoliquiritigenin (2′, 4′,4-trihydroxychalcone) diluted with an equal amount of (−)-liquiritigerin (4′,7-dihydroxyflavanone), or (b ) 14 C-(−)- liquirinin diluted similarly with isoliquiritigin were fed to subterranean clover seedlings and to cell-free extracts of garbanzo beans as discussed by the authors.
46 citations
TL;DR: The incorporation of dihydrokaempferol and quercetin into the pea plant was investigated in this paper, and the results gave further support to the postulated pathway: flavanone → dhydroflavonol → flavonol, in which the introduction of the 3′-hydroxyl group occurs at the dihydronol stage.
16 citations
6 citations
TL;DR: It has been established that steppogenin is (+)-5,7,2′, 4′-tetrahydroxyflavanone and stepposide is 7β-D-glucopytanoside.
Abstract: From the herbEuphorbia stepposa Zoz. two new compounds-steppogenin and stepposide-have been isolated. It has been established that steppogenin is (+)-5,7,2′, 4′-tetrahydroxyflavanone and stepposide is 5,7,2′, 4′-tetrahydroxyflavanone 7β-D-glucopytanoside.
5 citations
TL;DR: In this article, the 3' and 4' carboxylic acids of chalkones, flavanones, and flavonols are synthesized and the UV-maxima and IR-bands of these compounds are presented.
Abstract: Es werden die 3′- und 4-Carbonsauren von einigen Chalkonen, Flavanonen, Falvonen und Flavonolen synthetisiert und ihre UV- und IR-Absorptionsmaxiam angegeben. Die Schmelzpunktbestimmung der Flavanoncarbonsauren wird durch die beim Erhitzen eintretende Isomerisierung beeintrachtigt; uber einige Beobachtungen die ser „thermischen Isomerisierung” wird berichtet.
3′-and 4′-Carboxylic acids of chalkones, flavanones, flavones, and flavonols are synthesized. The UV-maxima and IR-bands of these compounds are presented. On heating flavanone carboxylic acids isomerize; for this reason the melting points are incorrect. Some observations of this so called ”thermic isomerization” are reported.
4 citations
TL;DR: In this paper, the IR spectrum of 5,7-dihydroxyflavanone (pinocembrin) was analyzed and determined to contain absorption bands at 1490, 1600 (C6Hs--), 1638 (C=O of a fiavanone nucleus), 1170, 1220 (C--O--C), 3100-3120 (hydroxy groups in ring A), 700 and 765 cm -1 (nonplanar vibrations of the CH groups of ring B bearing no hydroxy substituents) ~A
Abstract: Substance (I) forms crystals with a yellowish tinge, mp 194-195 ° C (methanol). Its IR spectrum contains absorption bands at 1490, 1600 (C6Hs--), 1638 (C=O of a fiavanone nucleus), 1170, 1220 (C--O--C), 3100-3120 (hydroxy groups in ring A), 700 and 765 cm -1 (nonplanar vibrations of the CH groups of ring B bearing no hydroxy substituents) ~A1C13 310 my. The acetate of (I) melted at 117-118 ° C (ethanol). The [2]. UV spectrum: kma x 294 mg (log e 4.23); '~max IR spectrum of the acetate of (1) showed that it lacked free hydroxy groups and had acetate groups (1696 and 1768 cm-i). UV spectrum: kmax 315 and 260 mg (log e 3.58 and 4.02). Substance (1) was identified as 5,7-dihydroxyflavanone (pinocembrin) [3,4].
4 citations
1 citations
TL;DR: The results strongly suggest that chalcone and isoflavone are not involved as intermediates in flavonoid biosynthesis as mentioned in this paper, contrary to the expectation that they are involved in biosynthesis.
Abstract: CHALCONES and flavanones have been shown to be the products from (a) are higher than those from precursors for many classes of flavonoid com- (b). Furthermore, within each experiment, the pounds.l Enzymic and in vitro feeding experi- specific activities of these compounds follow ments, however, show that chalcone and (-)- closely that of the chalcone but not that of the flavanone are interconvertible, and the question ( - )-flavanone. still remains as to whether both are directly These results strongly suggest that, contrary to involved as intermediates in flavonoid biosynthesis. expectations: flavones and isoflavones are formed TABLE Specific activities* of $avonoid compounds from clover seedlings fed [14C]chalcone or jlavanone