[PDF] Top 20 J. Braz. Chem. Soc. vol.10 número3
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J. Braz. Chem. Soc. vol.10 número3
... The aquatic humic substances investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. Molecular spectroscopy investigations of these humic ... See full document
7
J. Braz. Chem. Soc. vol.10 número3
... An iron disk electrode (Gallard-Schlesinger 99.999 %) with a diameter of 4.9 mm embedded in PTFE served as the working electrode. Its surface was polished with emery paper of grit 400, 600 and 1000 and with 1 micron ... See full document
8
J. Braz. Chem. Soc. vol.10 número3
... A new coumarin, 5,6-methylenedioxy-7,8-dimethoxycoumarin has been isolated from the stems of Metrodorea flavida , as well as known coumarins and alkaloids.. The structures of the new an[r] ... See full document
3
J. Braz. Chem. Soc. vol.10 número3
... 21. (a) Mori, K.; Fujioka, T. Tetrahedron 1984, 40, 2711. (b) San Martin, A.; Rovirosa, J.; Muñoz, O.; Chen, M.H.M.; Guneratne, R.D.; Clardy, J. Tetrahedron Lett. 1983, 24, 4063. (c) Smith, A.B., III; ... See full document
6
J. Braz. Chem. Soc. vol.10 número3
... The unit cell of the complex 7 was determined by a least-squares fit of settings for 25 strong reflections, with 10° ≤ θ ≤ 18°. Intensity measurements were carried out up to 27°, using ω/2θ scan mode. A yellow, ... See full document
9
J. Braz. Chem. Soc. vol.10 número3
... This work was supported by FAPERJ (Rio de Janeiro, Brazil) and CAPES (Brazil). The authors would like to thank Greenpeace (São Paulo, Brasil) for kindly providing the experimental data on air quality, CET/Rio for the ... See full document
6
J. Braz. Chem. Soc. vol.10 número3
... Presented here is a new process in two stages for bleaching peroxyformic sugar cane bagasse pulp combining photosensitization and photocatalysis. The first stage consists of an irradiation (1h), with tungsten or mercury ... See full document
6
J. Braz. Chem. Soc. vol.10 número3
... Significant correlation equations were obtained with the following molecular descriptors: the total surface area (A T ), the electrotopological state index (S (-o-) ) of the oxygen in po[r] ... See full document
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J. Braz. Chem. Soc. vol.10 número3
... IR spectra were recorded by means of a Perkin Elmer 283B spectrometer using Nujol mulls between CsI plates and NMR spectra with a Brucker DRX-400 Avance (400 MHz) spectrometer. The thermogravimetric data were ob- tained ... See full document
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J. Braz. Chem. Soc. vol.10 número5
... x 10 -13 mol cm -2 ( δ = Nf/S BET , onde Nf é a quantidade de Co-Ftalocianina adsorvida por grama de silica gel modificada ...x 10 -4 e 3,2 x 10 -3 mol L -1 , associado com sua alta estabilidade ... See full document
5
J. Braz. Chem. Soc. vol.10 número4
... stereoisomeric mixtures: an enantiomeric pair (R,R and S,S) and two meso compounds (R,S and S,R), in a 2:1:1 ratio (Scheme 2). These diastereomers were detected by 31 P- NMR, as three signals (0-10 ppm). ... See full document
6
J. Braz. Chem. Soc. vol.10 número6
... unknown equilibrium constants by least-square techniques were minimized. Three titrations were performed with the metal ion and each ligand. All the potentiometric studies were carried out in a Micronal (Brasil) model ... See full document
6
J. Braz. Chem. Soc. vol.10 número4
... interaction studies were prepared by dissolving the respec- tive NBGH until the desired concentration (13 mM, 25 mM, 50 mM and 75 mM) in a 7.25 x 10 -5 M stock solution of BSA (98% - Aldrich Chemical Company). NMR ... See full document
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J. Braz. Chem. Soc. vol.10 número4
... The static 31 P spectrum of the bromide salt is illustrated in Fig. 2. This was acquired with CP, a Hahn echo, and proton decoupling during acquisition. The general shape makes it clear that the asymmetry is non-zero and ... See full document
6
J. Braz. Chem. Soc. vol.10 número5
... 13. (a) Patai, S. (ed.) “The Chemistry of the Carbon-Ni- trogen Double Bond”. John Wiley and Sons, London, 1970. (b) Borton, D.; Ollis, D. “Comprehensive Or- ganic Chemistry - The Synthesis and Reactions of Organic ... See full document
8
J. Braz. Chem. Soc. vol.10 número5
... In order to identify the reaction products a preparative photolysis was carried out. Thus, 1.6 mmoles of the dicy- anoolefin 3-MDCN in hexane (100 mL) were degassed and irradiated for 5 h. A yellow oil was obtained after ... See full document
6
J. Braz. Chem. Soc. vol.10 número5
... Neste trabalho foram montados e caracterizados dois dispositivos eletrocrômicos (ou janelas eletrocrômicas) utilizando como materiais opticamente ativos polímeros instrinsecamente con- dutores. Os materiais usados na ... See full document
7
J. Braz. Chem. Soc. vol.10 número5
... Preparation of chiral diketone 7 from chiral imine 27 Methyl vinyl ketone (675 mg, 9.75 mmol) in 15 mL of dry THF was added dropwise to a solution of chiral 27 (745 mg, 3.25 mmol) in 15 mL of THF. The resulting mixture ... See full document
14
J. Braz. Chem. Soc. vol.10 número6
... in the initial part of the voltammogram since only reactions (8-10) are slowly occurring and blocking the surface. When the potential reaches ca. 1.0 V, the oxidation of the Pd surface starts (11) and, ... See full document
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J. Braz. Chem. Soc. vol.10 número5
... Trifluoromethanesulfonic acid (or trifluoroacetic acid) (1.2 mmol) 31 was added dropwise to a solution of the azide (1 mmol) in dichloromethane (10 mL) in a water-ice bath under nitrogen atmosphere and magnetic ... See full document
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