Results 181 to 190 of about 1,667 (218)
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Flavonoids from the seeds of Lonchocarpus costaricensis
Phytochemistry, 1985Abstract Seven flavonoids have been isolated from the seeds of Lonchocarpus costaricensis of which four appear to be novel. The new compounds have been identified as the β-hydroxychalcone demethylpraecansone-B and the flavanones 7-(3,3-dimethylallyloxy)-8-(3-hydroxy-3-methyl- trans -but-1-enyl)flavanone, 7-(3,3-dimethylallyloxy)-8-(3,3 ...
Peter G. Waterman, Elhadi N. Mahmoud
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Lonchocarpus—A fish-poison insecticide
Economic Botany, 1947The roots of this tropical vine are the source of the valuable insecticide rotenone, non-toxic to humans, and were imported into the United States in 1946 from Brazil and Peru, from both wild and cultivated material, to the extent of more than 11 million pounds.
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The Species of Ravenelia Occurring on Lonchocarpus
Mycologia, 1968This paper presents expanded and modified descriptions of Ravenelia atrocrustacea P. Henn., R. sydowiana Rick, R. lonchocarpiicola Speg., R. lonchocarpi Lagh. & Diet, and R. bakeriana Diet.
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Systematic significance of flavonoids in Derris and Lonchocarpus
Biochemical Systematics and Ecology, 1981Abstract It has been suggested that the flavonoid profiles might help to elucidate the problematical differentiation of the Derris and Lonchocarpus group of species. To test this possibility all flavonoid types known to occur in Tephrosieae were correlated biogenetically and “oxidation”/“methylation” (O/M) values were deduced for their ...
Ceres M.R. Gomes +4 more
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Isoflavonoid and pterocarpinoid extractives of Lonchocarpus laxiflorus
Journal of the Chemical Society C: Organic, 1969Two new members of the rare isoflavan series and two new pterocarpans have been isolated from Lonchocarpus laxiflorus. Physical methods involved in solving the structural problems associated with the penta-substituted ring B of three of these compounds include the study of methoxy-proton shifts and i.r. stretching frequencies.
Andrew Pelter, P. I. Amenechi
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Flavonoids from two Lonchocarpus species of the Yucatan Peninsula
Phytochemistry, 2002Leaves, stem bark and root of Lonchocarpus xuul and Lonchocarpus yucatanensis were studied separately. A chalcone, 2',4-dimethoxy-6'-hydroxylonchocarpin (), and the flavones 5,4'-dihydroxy-3'-methoxy-(6:7)-2,2-dimethylpyranoflavone (2) and 5,4'-dimethoxy-(6:7)-2,2-dimethylpyrano-flavone (3), together with the known carpachromene (4), were isolated from
Borges-Argaez, Rocio +2 more
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Twenty-three flavonoids from Lonchocarpus subglaucescens
Phytochemistry, 1996Abstract Chemical investigation of Lonchocarpus subglaucescens roots resulted in the isolation of 23 flavonoids, whose structures were elucidated by spectroscopic methods. Ponganone III, ovalichromene B, purpurenone, 12α-hydroxyrotenone, (2,3- trans -3,4- trans )-3,4,5,8-tetramethoxy-[2″,3″:7,6]-furanoflavan, 6″,6″-dimethylchromeno- [2″,3″:7,8 ...
Aderbal F. Magalhães +3 more
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Three dibenzoylmethane derivatives from Lonchocarpus species
Phytochemistry, 1997Abstract Three new dibenzoylmethane derivatives were isolated from petrol extracts of the roots of Lonchocarpus latifolius and L. muehlbergianus . Molecular structures were determined from spectroscopic data, especially NMR techniques. An alkyl group bonded to the central carbon (C-8) of a natural dibenzoylmethane, had not been found before ...
Aderbal F. Magalhães +4 more
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Dihydroflavonols and flavanones from Lonchocarpus atropurpureus roots
Phytochemistry, 1999Abstract From the petroleum extract of Lonchocarpus atropurpureus Benth. roots, 5,2′-dihydroxy-3-methoxy-6,7-(2″,2″-dimethylchromene)-8-(3″′,3″′-dimethylallyl)-flavanone and 2′,3,5-trihydroxy-6,7-(2″,2″-dimethylchromene)-8-(3″′,3″′-dimethylallyl)-flavanone were isolated, together with three known flavanoids and a mixture of two pentacyclic ...
Aderbal F. Magalhães +3 more
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Unusual flavonoids from Lonchocarpus orotinus seeds
Phytochemistry, 1987Abstract Seeds of Lonchocarpus orotinus have yielded five flavonoids the identities of which have been elucidated by spectroscopic analysis. In addition to the known minimiflorin three novel flavonoids, characterized by the presence of 2′,6′-dihydroxy substitution of the B-ring, were isolated and identified as orotinin (6′-hydroxyminimiflorin ...
Peter G. Waterman, El-Hadi N. Mahmoud
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