Showing papers by "Tom J. Mabry published in 1972"
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TL;DR: In this paper, nine methylated flavonols isolated from Larrea cuneifolia Cav. collected in Argentina have been fully characterized using UV, MS and NMR spectral data, all of which were identified as methyl ethers of quercetin and kaempferol.
105 citations
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TL;DR: One new and six known flavonoid methyl ethers were isolated variously from seven Artemisia taxa as mentioned in this paper, including dihydroquercetin 7,3′-dimethyl ether, which was obtained from A. pygmaea.
67 citations
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TL;DR: In this paper, the presence of hydroxyl or methoxyl groups at C 6 in flavones and 3-substituted flavonols is indicated when, in the UV spectral analysis in MeOH with added AlCl 3 -HCl, a Band I bathochomic shift (relative to the MeOH spectrum) of about 20 nm is observed for the C 5 -hydroxy-C 4 -keto-AlCl 3 complex; the procedure distinguishes C 6 oxygenation from that at C 8 in these compounds.
58 citations
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TL;DR: In this paper, the NMR spectra of all flavonoids were recorded in both CCl 4 and benzene, and both methoxyl and trimethylsilyl groups at certain positions showed diagnostic benzene-induced resonance shifts.
41 citations
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TL;DR: Distributional data for 12 flavonoids in 23 taxa of Oenothera, 2 species of Calylophus, and 1 species of Gaura are presented.
34 citations
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TL;DR: NMR, UV, and MS spectral data confirm the structure of calycopterin as 5,4′-dihydroxy-3,6,7,8-tetramethoxyflavone.
21 citations
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19 citations
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16 citations
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16 citations
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TL;DR: The distribution of 12 flavones and 19 isoflavones in 13 taxa of Thermopsis is reported and it is found that flavones are more common in E. coli than in other E.coli.
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TL;DR: The occurrence of hispidulin is reported in 34 additional species of Ambrosia, Gaillardia, Helenium, Hymenoxys, Plummera and Ratibida, all of which are recognized as members of two closely related tribes, the Helenieae and Heliantheae.
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TL;DR: The volatile terpene and sesquiterpene lactone patterns for 20 populations of Ambrosia psilostachya from the Texas Mainland and Gulf Coast Islands and 7 populations of A. cumanensis from near Vera Cruz, Mexico, were determined and the resulting volatile terPene data were analyzed by numerical classification methods as mentioned in this paper.