[PDF] Top 20 J. Braz. Chem. Soc. vol.9 número3
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J. Braz. Chem. Soc. vol.9 número3
... O sis te ma fe de ral de en si no su pe ri or do Bra sil pas sa, nes te mo - men to, por uma das suas mais pro fun das cri ses com res pe i to à for ma de ges tão, es co lha de di ri gen tes e po lí ti ca sa la ri al, es ... See full document
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J. Braz. Chem. Soc. vol.9 número3
... around 1.4 7,8 . Aveston et al. 9 by centrifuge data could only tell that in the range studied, the species probably contain more than 6 and less than 9 Mo atoms. Sasaki et al. proposed the presence of ... See full document
7
J. Braz. Chem. Soc. vol.9 número3
... Colorless crystals from MeOH, m.p. 188-189 °C. Spec- tral data are in accordance with literature values 3,4 . 13 C- NMR: Table 1. 1 H- NMR: Table 2. Heteronuclear 2D 1 H- x 13 C shift-correlated via long-range coupling ( ... See full document
7
J. Braz. Chem. Soc. vol.9 número3
... the gas sample is introduced into the scattering chamber the pressure is raised one order of magnitude. For each angle, the spectra are continuously recorded until a good signal to noise ratio is achieved. The background ... See full document
7
J. Braz. Chem. Soc. vol.9 número3
... 12. (a) Barbieri, R.; Silvestri, A.; Judice, M.T.L.; Ruisi, G.; Musmeci, M.T. J. Chem. Soc., Dalton Trans 1989, 519; (b) Omae, I. In Organotin Chemistry, J. Or- ganomet. Chem. Library ... See full document
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J. Braz. Chem. Soc. vol.9 número3
... After collection, the volatiles were thermally desorbed, using a modified injector port, directly on to the front of a DB-5 (30 m x 0.32 mm id x 1.0 µ m film, J & W Scientific Inc) or a CP-Wax-52CB 52CB (50 m ... See full document
11
J. Braz. Chem. Soc. vol.9 número3
... cycles, the maxima and the minima remaining practically constant. Furthermore, the electrode response towards dis- solved oxygen concentrations was also tested. The experi- ment was carr[r] ... See full document
6
J. Braz. Chem. Soc. vol.9 número3
... The feasibility of the use of a Batch Injection Analysis (BIA) system for potentiometric determination of acetylsalicylic acid in tablets, with a membrane ion selective electrode, was in[r] ... See full document
3
J. Braz. Chem. Soc. vol.9 número3
... In the transesterification of vegetable oils, a triglyceride reacts with an alcohol in the presence of a strong acid or base, producing a mixture of fatty acids alkyl esters and glycerol[r] ... See full document
12
J. Braz. Chem. Soc. vol.9 número3
... HA. 9 The complexing ability of a model compound for the phthalic derived sites of HA is compared with the models chosen for the nitrophthalic derived sites of NHA using two im- portant plant micronutrients, one a ... See full document
12
J. Braz. Chem. Soc. vol.9 número3
... charge measured would indicate that no more than half a monolayer of cadmium is formed on Pt(111). On the other hand, if the discharge is incomplete and a full monolayer of cadmium is formed, the apparent electrosorption ... See full document
8
J. Braz. Chem. Soc. vol.9 número3
... 2. Bekkum, H. van; Hoefnagel, A.J.; Koten, M.A. van; Gunnewegh, E.A.; Vogt, A.H.G.; Kouvenhoven, H.W. In Zeolites and Micropore Crystals, Hattori, T.; Yashima, T. Eds., Stud. Surf. Sc. Catal. 1993, 83, 379. 3. Neves, ... See full document
6
J. Braz. Chem. Soc. vol.9 número5
... 124.6 (C-12); 76.0 (C-3) and 83.1 (C-22), was used to establish that compound 1 contains the backbone of β -amir- ine. Both compounds exhibited similar NMR spectra, but the doublet of doublets observed at δ 3.22 ... See full document
4
J. Braz. Chem. Soc. vol.9 número5
... Figure 9 shows the effect of the incidence of polychro- matic light on the voltammograms of nickel in the presence of propargyl alcohol. The interaction between the organic compound and the electrode surface ... See full document
8
J. Braz. Chem. Soc. vol.9 número6
... (1), showed a coupling constant (J = 16.2 Hz) for the vinylic protons. The enantiomeric purity of Filbertone (1) was determined by GC chiral column (75% ee of (E)-(+)-5S- methylhept-2-en-4-one) (Fig. 1) and the ... See full document
3
J. Braz. Chem. Soc. vol.9 número5
... tum mechanics and an intermolecular potential model was proposed based on ab-initio calculations. The quantum scattering calculations were carried out in the diabatic basis and no rotational to radial couplings were ... See full document
6
J. Braz. Chem. Soc. vol.9 número6
... 1.66, m), all the carbon and hydrogen NMR spectral data obtained are identical to those proposed by Ksebati et. al. 17 The 1 H- 1 H and 1 H- 13 C long range correlation spectra as well as nuclear Overhauser enhancements ... See full document
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J. Braz. Chem. Soc. vol.9 número5
... with many cations and to their remarkable anti-tumoral 2-5 , catalytic 6 , electrocatalytic 7,8 and photochemical 9 proper- ties. Nevertheless, the methods available for the synthesis of new or even well-known ... See full document
6
J. Braz. Chem. Soc. vol.9 número6
... of these compounds to air and moisture was not taken into account. Only when techniques for working under anaero- bic conditions were developed, was the isolation and proper characterization of these compounds possible. ... See full document
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J. Braz. Chem. Soc. vol.9 número5
... Studies of metallic oxides highly dispersed on the sur- face of inorganic supports have received special attention in recent years 1-9 . In general this kind of material presents different properties in relation ... See full document
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