[PDF] Top 20 J. Braz. Chem. Soc. vol.13 número5
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J. Braz. Chem. Soc. vol.13 número5
... our community on the continued success of our Journal, established as the chemistry Latin American journal of greatest impact factor. We stress that this position depends directly on the[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... The hexane extract of leaves of Erythroxylum passerinum yielded besides sitosterol, β-amyrin, lupeol and erythrodiol, β-amyrin palmitate, 3β,28-dihydroxy-olean-12-enyl palmitate, 3β,11β- dihydroxy-olean-12-enyl ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... The chemistry of phosphine and phosphite complexes of Ru(II) and Ru(III) tetraammines has received considerable attention, 1-11 efforts being directed to the understanding of the trans [r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... The total organic carbon contents (TOC) and nitrogen (N) values of the gut contents of the foregut (FG), descending midgut (DEG), ascending midgut (ASG) and hindgut (HG) of the five spe[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... However, no enantioseparation was achieved in these cases (DL-threonine and DL-serine) or with less hydrophobic α - amino acids (Table 2), indicating that the presence of a polar hydrox[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... reveals three phosphorus atoms bonded together, P(2)-P(1)- P(5), and two P=C doubled bonds. The distance between P(2)-P(1) and P(1)-P(5) (2.250(1) and 2.191(2) Å, respectively) are in the expected range for a P-P single ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... 7. RI exp. = Relative Retention Index calculated applying the Van den Dool and Kratz equation (van den Dool, H.; Kratz, P. D.; J. Chromatogr. 1963, 11, 463); t = traces. GC-MS-Analy- ses were carried out using a ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... In order to obtain quantitative recoveries of metal ions on naphthalene-dithizone solid phase, the separation and pre-concentration procedure were optimized for various experimental para[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... Cyclic voltammograms (CVs) obtained for the Si:Zr modified carbon paste electrode (Figure 4a) did not show any current peak in the potential range investigated, while for the Si:Zr: FAD [r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... occurrence of amino acids in over 200 proteins, showed that the proteins are made up with the following composition: 40.1% of the amino acids without polar aliphatic R groups; 8.1% of th[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... shows a resonance due to a hydride ligand at δ -15.5 [J(HP) 8 and 2 Hz] and a multiplet at δ -7.0-8.0 due to the phenyl hydrogens. The small coupling observed between the hydride and the µ-PPh 2 phosphorus nucleus ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... of benzene. The solution turned yellow and was left stirring for 18 h, after which time the solvent was removed under reduced pressure. The residual solid was triturated with ethyl ether yielding 105.8 mg (26%) of 11 as ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... The standard methods employed for the determination of acidity of oils are based either on titrimetry with visual indicators or, mainly in the case of coloured samples, on potentiometric[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... On the contrary, when the interaction energy between substrate and polymer is stronger than that between substrate and solvent, or when both interaction energies are weak, the films obta[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... The crude chlorohydrins were treated with KOH in a biphasic media (water / ether / pentane) to produce the epoxides in excellent total isolated yields (Scheme 2). The purity of the products was > 90 - 99 % (by HRGC) ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... correlations between the signal at δ 5.97 (H-3) with the carbon signals at δ 159.4, 139.7 and 102.3 permitted to assign these resonances to C-2, C-1’”, and C-4a, respectively. The correlations of the signal at δ 14.62 ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... Separation and Pre-concentration of Cadmium, Copper, Lead, Nickel and Zinc by Solid-Liquid Extraction of their Cocrystallized Naphthalene Dithizone Chelate in Saline Matrices. Antônio C[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... Determination of phosphate, phenols, nitrite, sulphide and total iron in waters by the proposed method and reference procedures (flow systems with continuous reagent addition. Reagent am[r] ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... 4. d’Angelo, J.; Cavé, C.; Desmaële, D.; Gassama, A.; Thominiaux, C.; Riche, C.; Heterocycles 1998, 47, 725; Hadden, M.; Nieuwenhuyzen, M.; Potts, D.; Stevenson, P. J.; J. Chem. Soc., ... See full document
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J. Braz. Chem. Soc. vol.13 número5
... d, J gem 11.6, one of PhCH 2 ); 4.74 (1 H, d, J gem ...d, J gem 11.6, one of PhCH 2 ); 4.67 (1 H, d, J 1,2 ...d, J gem ...dd, J gem 12.7 J 6,5 ...dd, J gem 12.7 ... See full document
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