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Showing papers by "Tom J. Mabry published in 1984"


Journal ArticleDOI
TL;DR: A population of Helianthus maximiliani from south-central Texas was shown to have a sesquiterpene lactone chemistry which was completely different from that reported for collections of this species from Kansas and north- central Texas.

38 citations



Journal ArticleDOI
TL;DR: The isolation and spectral data of a new flavonoid, 6- methoxykaempferol 3-O-beta-D- robinobioside (3), are reported for the first time.
Abstract: Six flavonoids were isolated from Brickellia arguta and identified using chemical and spectral methods. The isolation and spectral data of a new flavonoid, 6- methoxykaempferol 3-O-beta-D- robinobioside (3), are reported for the first time. Three of these flavonoids were tested and showed inhibition of rat lens aldose reductase.

23 citations


Journal ArticleDOI
TL;DR: A new highly oxygenated flavone methyl ether has been isolated from Brickellia veronicaefolia and B. chlorolepis as mentioned in this paper, which was identified as 5,6′-dihydroxy-6,7,2′,3′,4′-pentamethoxyflavone and given the name brickellin.

21 citations



Journal ArticleDOI
TL;DR: A sesquiterpene ester, tingitanol, isolated from Ferula tingitana L, was assigned as 1β,3β-dihydroxy-4α,8α-diangeloyloxydauc-5-ene on the basis of spectral, analytical, and X-ray data.

18 citations


Journal ArticleDOI
TL;DR: Four of the germacranolides isolated from the hexaploid species Helianthus californicus are new, including a 1-oxo-3,10-diol without any carbon-carbon double bonds in the main ring whose structure was confirmed by X-ray crystallography.

15 citations



Journal ArticleDOI
TL;DR: There appear to be no major differences between the terpenoid chemistry of Viguiera and that of Helianthus, a genus believed to be very closely related to VigUiera on morphological grounds.

12 citations



Journal ArticleDOI
TL;DR: Three new germacranolides, including two heliangolides (niveusin C-2′,3′-epoxide and 1,2-dehydroniveusINC-2'',3''-epoxyangeloyloxycostunolide-1β,10α-oxide) were isolated from Viguiera microphylla and their structures were established by spectroscopic analyses, including extensive 1H and 13C NMR decoupling experiments and chemical transformations as discussed by the authors.

Journal ArticleDOI
TL;DR: The two furanoheliangolides budlein A and a new compound, ° 4,15 -isoatripliciolide tiglate, were isolated from the hexaploid sunflower Helianthus schweinitzii.


Journal ArticleDOI
TL;DR: These results support current ideas on both the subgeneric taxonomic disposition of these two spcies and the possible origin of the polyploid H. hirsutus.

Journal ArticleDOI
TL;DR: A series of 2α-hydroxy-8β-acyloxygermacrolides and the heliangolide niveusin A were isolated from a dichloromethane extract of Helianthus gracilentus.




Journal ArticleDOI
TL;DR: Ten flavonoids were obtained from Gaura triangulata including luteolin and lutenolin 7-glycoside derivatives which are atypical for the family Onagraceae, and Apigenin-based C -glycosylflavones, previously reported from the Onag race in the monogeneric tribe Circaeeae, have been identified.