[PDF] Top 20 J. Braz. Chem. Soc. vol.11 número6
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J. Braz. Chem. Soc. vol.11 número6
... In December, 1999 the first issue of the Brazilian Meeting on Chemical Ecology (I EBEQ) was held at the Chemistry Department of Universidade Federal do Paraná and gathered 125 chemists a[r] ... See full document
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J. Braz. Chem. Soc. vol.11 número6
... amine 11 was best accomplished with lithium aluminum ...of 11 with hydrochloric acid gave (+)-polyzonimine (1), whose enantiomeric purity could be estimated by GC analysis on Chirasil-DEX-CB ... See full document
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J. Braz. Chem. Soc. vol.11 número6
... papers the known limonoids from Cedrela are typical of the Swietenioideae 7-9 . On the other hand, Toona differs from other genera of this subfamily, notably by the absence of limonoids of the mexicanolide group. Our ... See full document
11
J. Braz. Chem. Soc. vol.11 número6
... absoluta males to pheromone-baited traps, using the synthetic major component of its sex pheromone, (3 E ,8 Z ,11 Z -14:Ac), leading to pest mating disruption and, consequently reductio[r] ... See full document
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J. Braz. Chem. Soc. vol.11 número6
... Alcohol 9 was converted into its corresponding tosylate 10 (93% yield) and then coupled with n-hexyl magnesium bromide, using Li 2 CuCl 4 as a catalyst 8 , affording 11 in 90% yield. Catalytic hydrogenation of the ... See full document
7
J. Braz. Chem. Soc. vol.11 número6
... of Z9-14Ac, Z11-16Ac and Z9-12Ac in S. frugiperda from Guadeloupe (cited as a personal communication from C. Descoins) 10 suggested an examination of the antennally active components (GC/EAD) in the pheromone gland of S. ... See full document
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J. Braz. Chem. Soc. vol.11 número6
... in CDCl 3 solution with a 5 mm broad band probe (normal configuration). Optical rotation values were measured with a Polamat A polarimeter in a 1 dm cuvette. Melting point values were measured with a Microquímica ... See full document
9
J. Braz. Chem. Soc. vol.11 número6
... It was difficult to estimate the natural concentration of 1 in L. violacea tissue, mainly because the purification of the diterpenes involved loss of metabolites and the techniques employed may had resulted in metabolite ... See full document
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J. Braz. Chem. Soc. vol.11 número6
... Plots of Kováts retention indexes determined on DB-WAX stationary phase versus double bond position for C 12 monounsaturated aldehydes, alcohols, and acetates... values range from appro[r] ... See full document
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J. Braz. Chem. Soc. vol.11 número6
... A brief retrosynthetic analysis is depicted for compounds 1 and 3 (Scheme 1). (±) – Citronellol 4 serves as starting material to the synthesis of the key and common intermediate for both target molecule, aldehyde 6. From ... See full document
6
J. Braz. Chem. Soc. vol.11 número6
... patterns of the 11 species investigated here reveals distinct differences: Lestrimelitta limao contains only a few ethyl esters and long chain acetates. Geotrigona mombuca is almost free of esters but contains ... See full document
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J. Braz. Chem. Soc. vol.11 número6
... Several other substances may be involved in chemical defense, such as iridoid glycosides, cyanogenic glycosides, glucosinolates, pyrrolizidine and tropane alkaloids, aristolochic acids, [r] ... See full document
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J. Braz. Chem. Soc. vol.11 número3
... and 0.2 mmole of Mn 2+ (11 points) are depicted in Figure 1. The curve of the galactomannan alone starts at pH 4.5, followed by a small break until pH 6.0 and continues until precipitation near pH 9.0. In the ... See full document
8
J. Braz. Chem. Soc. vol.11 número2
... coordination chem- istry has led to a number of new powerful synthetic methods involving the selective formation and/or cleavage of C-C and C-heteroatom ... See full document
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J. Braz. Chem. Soc. vol.11 número4
... In the ON state (voltage zero), this integrated circuit con- ducts current in either direction, maintaining the resis- tance nearly constant over its signal handling range. In the OFF state, it blocks the voltages making ... See full document
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J. Braz. Chem. Soc. vol.11 número3
... Objectively, to study how the factors influence a re- sponse, it is crucial to know which of these factors are larger, how they contribute to the response investigated, and fur- thermore, whether they interact with one ... See full document
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J. Braz. Chem. Soc. vol.11 número5
... Dence, C.W., Eds.; Springer Verlag; Berlin, 1992, p. 409. 7. Robert, D. In Methods in Lignin Chemistry, Lin, S.Y.; Dence, C.W., Eds.; Springer Verlag; Berlin, 1992, p. 250. 8. Berns, J; Meier, D. and Faix, O. ... See full document
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J. Braz. Chem. Soc. vol.11 número2
... 30. De Almeida, W. B.; Dos Santos, H. F.; Rocha, W. R.; Zerner, M. C. J. Chem. Soc., Dalton Trans. 1998, 15, 2531. 31. GAUSSIAN 94 (revision A.1). Frisch, M. J.; Trucks, G. W.; Schlegel, H. ... See full document
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J. Braz. Chem. Soc. vol.11 número4
... Various acid diterpenes of Copaifera cearensis Huber ex Ducke were isolated from the crude extract by flash Silica Gel/Potassium Hydroxide Chromatography.. The main components were ide[r] ... See full document
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J. Braz. Chem. Soc. vol.11 número4
... Table 4 reports the final results for Cu, Fe, Mn and Zn determinations using the optimized slurry sampling method by comparing them with those obtained using FAAS and ICP-AES after micro[r] ... See full document
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