[PDF] Top 20 J. Braz. Chem. Soc. vol.10 número1
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J. Braz. Chem. Soc. vol.10 número1
... É com imen sa sa tis fa ção que pu bli ca mos o nú me ro 1 do vo lu me 10 do Jour nal of the Bra zi li an Che mi cal So ci ety, JBCS. C o m e m o r a m o s d e z a n o s i n i n t e r r u p t o s de uma re v i s t ... See full document
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J. Braz. Chem. Soc. vol.10 número1
... All experiments were performed using a high resolution gas chromatograph (Hewlett Packard, model 5890 serie II, Palo Alto - CA, USA) equipped with a nickel-63 electron capture detector. Chromatographic data were ... See full document
6
J. Braz. Chem. Soc. vol.10 número1
... in C-C bonds and two attached to Csp 2 carbonyl carbon] were identified by the comparative analysis of the hydrogen decoupling spectra (PND = proton noise decoupling) and by the DEPT te[r] ... See full document
9
J. Braz. Chem. Soc. vol.10 número1
... Table 1 shows the 1 H-NMR chemical shifts of the methine protons (joined to C- α ), the 13 C-NMR chemical shifts of C-1, C- α , C-1’ and C-4’, the values of the Hammett.. substituent c[r] ... See full document
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J. Braz. Chem. Soc. vol.10 número1
... From the experiments with the X-ray microprobe it was noted that copper is not distributed evenly on the surface in the 100 µm range and this effect is more intense in chro- mium-doped solids. In contrast, chromium is ... See full document
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J. Braz. Chem. Soc. vol.10 número1
... Um novo método espectrofotométrico para determinação de zinco(II) é proposto usando um derivado da 8-hidroxiquinolina, o ácido 7-(4-nitrofenilazo)-8-hidroxiquinolina sulfônico (p-NIA- ZOXS). A reação entre o p-NIAZOXS e ... See full document
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J. Braz. Chem. Soc. vol.10 número1
... Carbon monoxide insertion into metal alkyl or aryl bonds is a textbook reaction 10 , but this process in alkyl and aryl containing carbonyl clusters has only been docu- mented in rare cases 5,11-13 . We have ... See full document
11
J. Braz. Chem. Soc. vol.10 número1
... There is no effect of maleic anhydride concentration on the degree of maleic anhydride grafting of EPDM (1.7% of diene) rubber, using 2.0 g of EPDM and 0.15 g of dibenzoyl peroxide, at 80 °C for 3 h. The conversion ... See full document
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J. Braz. Chem. Soc. vol.10 número1
... 2-Bromo-2-nonanone [12]. To a solution of 855 µL (5.00 mmol; 1 eq.) of 2-nonanone [15] in 10 mL of acetoni- trile, were added dropwise and successively 726 µL (5.50 mmol; 1.1 eq.) of TMSBr and 390 µL (5.50 mmol; 1 ... See full document
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J. Braz. Chem. Soc. vol.10 número1
... diester 10, by treatment with potassium permanganate under many differ- ent reaction conditions, were unsuccessful, giving the de- sired ester in poor overall yields ...chlorite-DMSO, 10 however the alcohol ... See full document
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J. Braz. Chem. Soc. vol.10 número1
... A similar conclusion has been drawn for platinum(II) complexes 4 . The chemical shifts of P A are in accordance with those found for platinum and palladium complexes 4 . In all cases a deshielding is observed upon ... See full document
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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 número5
... x 10 -13 mol cm -2 (δ = Nf/S BET , where Nf is the amount of adsorbed Co-phtalocyanine per gram of modified silica gel) of the complex species material ...x 10 -4 and 3.2 x 10 -3 mol L -1 , ... 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
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J. Braz. Chem. Soc. vol.10 número5
... n-Butyllithium in hexane (13.6 mL, 22 mmol) was added dropwise at -78 °C to a solution of 2,4,4-trimethyl- 2-oxazoline (2.486 g, 22 mmol) in dry THF (20 mL), under nitrogen. After stirring for 30 minutes, the resulting ... See full document
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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
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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
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J. Braz. Chem. Soc. vol.10 número4
... The position of the hydroxyl groups was obvious from the 1 H, 1 H coupling constants: 3 J(H-7’, H-8’) = 8.8 Hz (ortho-coupling); typical AA’XX’ sub-spectrum for H- 2/H-3/H-5/H-6 in 2; although the spin-system of ... See full document
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J. Braz. Chem. Soc. vol.10 número5
... 1. For reviews on marine natural products see: (a) Faulk- ner, D.J. Nat. Prod. Rep 1998, 15, 113; and previous issues of this serie dealing with marine natural prod- ucts. (b) Kelecom, A. J. Braz. ... See full document
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J. Braz. Chem. Soc. vol.10 número4
... Fig. 10 shows the 129 Xe spectra of three EPDM samples filled with the carbon blacks N110, N330 and N550, which have aggregate sizes of 18, 30 and 56 nm, ...Fig. 10 is a slight broadening of the EPDM line ... See full document
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