[PDF] Top 20 J. Braz. Chem. Soc. vol.13 número2
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J. Braz. Chem. Soc. vol.13 número2
... Entretanto, embora o JBCS ain- da não faça parte do seleto grupo de periódicos com alto fator de impacto, lembramos aos auto- res que é de extrema importância que publiquem, também no [r] ... See full document
2
J. Braz. Chem. Soc. vol.13 número2
... (dd, J 9 and 3 Hz, H-3), 5.85 (dd, J 17 and 11 Hz, H-14), 5.13 (dd, J 17 and 1 Hz, H- 15a), ...(dd, J 11 and 1 Hz, H-15b), ...); 13 C-NMR ... See full document
4
J. Braz. Chem. Soc. vol.13 número2
... 29. Frisch, M. J.; Trucks, G. W.; Schlegel, H. B.; Gill, P. M. W.; Johnson, B. G.; Robb, M. A.; Cheeseman, T. K.; Petersson, G. A.; Montgomery, J. A.; Raghavachari, K.; Al-Laham, M. A.; Zakrzewski, V. G.; ... See full document
7
J. Braz. Chem. Soc. vol.13 número2
... Ground-state diffuse reflectance proved to be by itself a good technique for the evaluation of total PAH content of urban particulate matter, since results directly correlate with data o[r] ... See full document
6
J. Braz. Chem. Soc. vol.13 número2
... The observed small dependence of the tautomeric energy barriers on the nature of the substituents was rationalized by a mechanism of tautomerism, which involves a zwitterionic intermedia[r] ... See full document
9
J. Braz. Chem. Soc. vol.13 número2
... This study presents some additional information on the alternative utilization of Jackfruit crude extracts in selective phenol oxidation reactions, using catechol and the o-, m- e p- cre[r] ... See full document
6
J. Braz. Chem. Soc. vol.13 número2
... Detailed EPR measurements with the platelets oriented parallel and perpendicular to the applied magnetic field revealed more strucutural details of the F (I) and Fe (II) sites absorpti[r] ... See full document
6
J. Braz. Chem. Soc. vol.13 número2
... 1. Francke, W.; Schröder, W.; Curr. Org. Chem. 1999, 3, 407; Howse, P. E.; Jones, O. T.; Stevens, I. D. R.; Insect Phero- mones and their Use in Pest Management; Chapman & Hall: London, 1998; Mori, K.; Eur. ... See full document
5
J. Braz. Chem. Soc. vol.13 número2
... We wish to thank the Royal Society of Chemistry (UK) for the J W T Jones fellowship (LCAB), the South-western State University of Bahia (UESB), the Brazilian agency CNPq for financial support and Dr. João Semir ... See full document
5
J. Braz. Chem. Soc. vol.13 número2
... Dichloromethane extract and fractions were chroma- tographed on a silica gel column (Merck, particle size: 230-400 mesh) at atmospheric pressure. TLC was carried out on silica gel (Merck, GF 254 ) using hexane:ethyl ... See full document
5
J. Braz. Chem. Soc. vol.13 número2
... and 13; 4 ® 5) or, alternatively, an O-methylation at the 2-hydroxyl giving 4-hydroxy-2-methoxy-5-prenylcinnamic acid, which makes the formation of the coumarin lactone ring impossible and may be postulated as the ... See full document
7
J. Braz. Chem. Soc. vol.13 número2
... spectra were recorded in CDCl 3 at room temperature on a Bruker Avance DPX 200 operating at 200 and 50 MHz. The chemical shifts are reported in values (ppm) relative to the solvent CDCl 3 ( = 7.26 for 1 H NMR and ... See full document
7
J. Braz. Chem. Soc. vol.13 número2
... complexing capacities determined using the SEP-PAK C- 18 copper extraction varied from 28 % at station 19 to 90 % at station 7. The high value of copper bound (90 %) in station 7 compared to other stations may result ... See full document
11
J. Braz. Chem. Soc. vol.13 número2
... showed the anomeric proton signal at 5.51 ppm (J 4.2 Hz) as a doublet. The coupling constant between H-1 and H-2 suggests a torsion angle of -130°. The semi-empirical calculations provided a value of -131.64° ... See full document
7
J. Braz. Chem. Soc. vol.13 número2
... Despite all the investigations of steroids in the marine environment, the current analytical methodologies for steroids in marine sediments are laborious and time- consuming, involve mul[r] ... See full document
7
J. Braz. Chem. Soc. vol.13 número2
... Powder X-ray diffraction was performed on a Shimadzu XD-3A diffractometer, using CuK radiation and 2 = 5- 50°. Copper contents were determined by X-ray fluores- cence (XRF) on a Spectrace TX-5000 instrument, using ... See full document
7
J. Braz. Chem. Soc. vol.13 número2
... All five HA presented a much higher aromatic and lower carboxylic contents than those obtained for an Australian brown coal HA 8 and those usually reported for soil HA, 1,21. but are in[r] ... See full document
6
J. Braz. Chem. Soc. vol.13 número2
... radicals and the Cu(II) ions are coupled ferromagnetically. The magnetic field destroys this ferromagnetic alignment progressively and the spins of the radicals begin to align parallel to the spins of the Mn(II) ions. ... See full document
7
J. Braz. Chem. Soc. vol.13 número2
... When the cellulose tris (3,5-dimethylphenylcarbamate) stationary phase was used under reversed phase conditions (CHIRALCEL OD-R), the chiral discrimination behavior also changed, being u[r] ... See full document
10
J. Braz. Chem. Soc. vol.13 número2
... Diethyl ether (10ml) and water (25ml) were added, and the viscous organic layer separated. The white residue was insoluble in most organic solvents and only[r] ... See full document
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