[PDF] Top 20 J. Braz. Chem. Soc. vol.16 número6B
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J. Braz. Chem. Soc. vol.16 número6B
... Raimundo Braz-Filho iniciou sua carreira científica em 1960, como bolsista de Iniciação Científica da Comissão Central de Pesquisa da UFC, sob a orientação do Professor José Wilson de Alencar, o primeiro mestre em ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... Compound 2 was isolated as yellowish oil, in a mixture with 1. Due to the small quantity of the mixture, we have not attempted to separate both compounds in order to avoid any loss of material. However, its NMR data were ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... Fractionation of T. fuchsiaefolia alkaloidal stem bark extracts resulted in five indole alkaloids which had already been reported for this same species: coronaridine (1), voacangine (2), conopharyngine (3), ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... Many Piper species are aromatic and as a consequence the chemical composition of the essential oils of several of them has been the subject of incessant studies, revealing a diverse range of volatile components, ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... of an 1,3,5-trisubstituted aromatic ring was inferred by the three broad singlets at δ 6.41, 6.38 and 6.24 (Table 2). This spectrum also showed signals attributable to one methoxyl ( δ 3.73) and an aliphatic chain ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... Gas chromatography with flame ionization detection (GC/FID) was carried out on a Varian Star Model 3350 instrument using a capillary column coated with DB-5 (30 m x 0.25 mm i d , 0.25 μm film thickness; J & W ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... fruticosa showed insecticidal activity against the leaf- cutting ants Atta sexdens rubropilosa.. Keywords: Cedrela fissilis, Cipadessa fruticosa , limonoids, triterpenes, insecticidal [r] ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... HPLC analysis carried out with plants selected to represent each of these three clusters, showed no significant seasonal variation in the concentration of 1 and 2 in none of them ove[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... The authors are grateful to CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), IMSEAR/CNPq/MCT (Instituto do Milênio do Semi- Árido), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... Dried and powdered roots of H. indicum (1200 g) were exhaustively extracted with EtOH at room temperature (x 3). The combined extracts were evaporated in vacuum to yield a crude extract (90.0 g), which was processed in ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... isoflavone (4) (84% yield). The oxypropanolamine 6, that would lead to the ammonium salt 7, was synthesized by a reaction sequence that started with the preparation of the glycidic ether 5 (40% yield) from the ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... 28. Singh, S.K.; Prasad, A.K.; Olsen, C.E.; Jha, A.; Jain, S.C.; Parmar, V.S.; Wengel, J.; Phytochemistry 1996, 43, 1355. 29. Guillet, G.; de Luca, V.; Plant Physiol. 2005, 137, 692. 30. Borg-Olivier, O.; Monties, ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... 10. Burke, B.; Nair, M.; Phytochemistry 1986, 25, 1427. 11. Nair, M.G.; Burke, B.A.; J. Agric. Food Chem. 1990, 38, 1093. 12. Lago, J.H.G.; Ramos, C.S.; Casanova, D.C.C.; Morandim, A.; Bergamo, D.C.B.; ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... This paper deals with the X-ray diffraction analysis of epoxy-fraxinellone and its toxicity to leaf-cutting ants, describes the isolation of fraxinellonone and fraxinellone for the first[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... hydrochloric acid at 105 °C, under reflux, for 24 hours. The acid was removed under vacuum, and the acid-free mixture of amino acids was derivatized with the addition of 1-fluoro- 2,4-dinitrophenyl-5-L-alanine amide ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... signals at δ H 8.07 (2H, br, d J = 7.7 Hz) and 7.56-7.46 (3H, m) which indicates the possibility of a mono-substituted ring B in a flavonoid. The presence of a 2,2-dimethyl- chromene moiety was indicated by the ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... sellowii , its antimicrobial activity and the biological screening by brine shrimp lethality assay, which is considered an efficient tool for preliminary evaluation of the pharmacologica[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... Keywords: endophytic fungi, Phomopsis cassiae , Cassia spectabilis , cytotoxic metabolites, antifungal activity.. Introduction.[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... these, the signals of C-16, C-22 and C-26 and one additional signal for a carbon-bearing nitrogen additionally supports the proposed aminospirosolane structure for 1. EIMS fragments at m/z 115 and 139 corroborated ... See full document
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J. Braz. Chem. Soc. vol.16 número6B
... The transesterification reaction can be catalyzed by both acid and alkaline catalysts, using a homogeneous or heterogeneous catalytic process.. Sodium and potassium hydroxide are commonl[r] ... See full document
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