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Sequestration of prenylated benzoic acid and chromenes by Naupactus bipes (Coleoptera: Curculionidae) feeding on Piper gaudichaudianum (Piperaceae)
(BIRKHAUSER VERLAG AG, 2009)
The curculionid beetle Naupactus bipes (Germar, 1824) (Coleoptera: Curculionidae: Brachycerinae) has shown feeding preference for leaves of Piper gaudichaudianum, demonstrating an unexpected specificity for an insect ...
Intraspecific variability of dihydrochalcone, chromenes and benzoic acid derivatives in leaves of Piper aduncum L. (Piperaceae)
(ACADEMIC JOURNALS, 2009)
Chemical analysis carried out in leaves of 18 specimens of Piper aduncum L. (Piperaceae) occurring at Ripasa Reserve, Araraquara, SP, Brazil indicated two distinct populations when investigated over a period of 14 months ...
Chemistry, toxicity and antifeedant activity of the resin of Flourensia thurifera
(1997)
The resin extract from leaves and stems of Flourensia thurifera displayed high levels of activity in the brine shrimp (Artemia salina) and antifeedant disk-choice (Spodoptera littoralis) bioassays. A bioassay-guided ...
Biosynthetic insights into p-Hydroxybenzoic acid-Derived benzopyrans in piper gaudichaudianum
(2018-05-01)
Piper gaudichaudianum Kunth (Piperaceae) accumulates gaudichaudianic acid, a prenylated benzopyran, as its major component. Interestingly, this trypanocidal compound occurs as a racemic mixture. Herein, transcriptomic ...
Combined use of tandem mass spectrometry and computational chemistry to study 2H-chromenes from Piper aduncum
(2019-07-01)
Natural 2H-chromenes were isolated from the crude extract of Piper aduncum (Piperaceae) and analyzed by electrospray ionization tandem mass spectrometry (ESI-MS/MS) applying collision-induced dissociation. Density functional ...
Síntese regiosseletiva de cromenos e cromenonas derivados de organocalcogênio via reações de ciclização intramolecular
(Universidade Federal de Santa MariaBRQuímicaUFSMPrograma de Pós-Graduação em Química, 2012-08-30)
In the first part of this work, a series of organochalcogen propargyl aryl ethers (19 examples) was easily prepared by reaction of propargyl aryl ethers and different organochalcogen electrophilic species. In general, the ...