Showing papers on "Flavanone published in 1974"
TL;DR: The structure and absolute configuration of lupinifolin, (2S) - 4′,5 - dihydroxy - 8 - (3‴ - methyl - 2‴- butenyl) - 2″, 2″ - dimethylpyrano[5.6″ - g]flavanone, and (2R,3R) - 8 − (3´)-methyl - 2´-butenyl - 3,4´,5 − trihydroxy − 2'',2'' - dimethyltropyrano [5.
48 citations
TL;DR: The correlation between colour of Acacia heartwoods and structure, phenolic substitution, stereochemistry and composition of their flavonoid components is discussed.
22 citations
TL;DR: From the pods of Acacia farnesiana, a new flavanone acylglucoside was isolated identified as (−)5,7,4′-trihydroxy-flavanone (Naringenin)-7, O -β-d -[6″- O -galloyl]-glucopyranoside as mentioned in this paper.
12 citations
TL;DR: Examination of the methanolysis products of III permethylate (XV) and the spectral data of XV evidenced that III is 4'-O-β-D-glucopermethylate of 2', 4, 4'-trihydroxy-6'-methoxychalcone (dehydro-para-asebotin), from which V is yielded on acid treatment.
Abstract: Besides luteolin 4'-D-glucoside (I) and luteolin (II), a chalcone glycoside (III), C22H24O10·1 1/2 H2O, mp 199-200°, [α]30D-85.2°(methanol), ultraviolet spectrum (UV) λEtOHmax 368 nm, was isolated from the flowers of Gnaphalium affine D. DON. III was acid hydrolyzed to give glucose and a flavanone (V), mp 256°, UV λEtOHmax 228, 284 nm, which was identified as 4', 7-dihydroxy-5-methoxyflavanone by chemical and spectral data and by direct comparison of the diethyl ether (VIII) with an authentic sample. The sample, 4', 7-diethoxy-5-methoxyflavanone (VIII) was prepared, according to the result of a preliminary experiment (Table I), by stepwise alkylations of naringenin (IX) with an ether solution of diazoethane in absolute methanol for 3 hr and then with diazomethane in 70% methanol for 24 hr. Further examination of the methanolysis products of III permethylate (XV) and the spectral data of XV evidenced that III is 4'-O-β-D-glucopermethylate of 2', 4, 4'-trihydroxy-6'-methoxychalcone (dehydro-para-asebotin), from which V is yielded on acid treatment. This is the first isolation of III and V from natural sources.
9 citations
TL;DR: In this paper, the relative bitterness values were discussed in comparison with naringin and neohesperidin, and also hesperetin-7β-kojibioside and -7-β-sophoroside were prepared by the coupling of naringenin or heSperetin with the α-acetobromo derivatives of the appropriate disaccharides.
Abstract: Naringenin-7-β-kojibioside, -7-β-sophoroside, -7-[α-d-galactosyl(l→2)β-d-glucoside], -7-[β-d-glucosyl(l→2)β-d-galactoside], and also hesperetin-7-β-kojibioside and -7-β-sophoroside were prepared by the coupling of naringenin or hesperetin with the α-acetobromo derivatives of the appropriate disaccharides, followed by saponification.Their relative bitterness values were discussed in comparison with naringin and neo-hesperidin.
5 citations