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J. Braz. Chem. Soc. vol.14 número1
... The events of the first two phases will have the participation of the Directors and Council of the SBQ , the Editors of Química Nova and the Journal of the Brazilian Chemical Society[r] ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... was done based on the HMQC and HMBC spectral analysis. For example, the methyl group at δ H 0.96 (δ 15.1, C-20) did correlate to a quaternary carbon at δ 36.6 (C-10), a methylene at δ 39.2 (C-1), and two methynes at δ ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... Sedimentary organic C/N ratios are useful in distinguishing between an algal and vascular land-plant origin of organic matter. The presence or absence of cellulose in the plants sourcing organic matter influences the C/N ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... 19c (see Experimental). The formation of 19d may be visualized as occurring through the aza-annulation of the initial C-adduct of the reaction of 1 and 13d. To support this mechanistic proposal we decided to perform the ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... Square wave voltammograms for picloram in the four spiked water samples obtained from: (a) Purified Water (labora- tory); (b) Santa Maria do Viterbo creek; (c) Gregorio creek; and (d) Mo[r] ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... spectra of the unsymmetrical derivatives 2 and 4-5 the dppm phosphorus nuclei appear as two doublets (J P-P ~130Hz) whose chemical shift difference decreases with the decreasing electronic asymmetry of the ... See full document
4
J. Braz. Chem. Soc. vol.14 número1
... where E ver (Q) represents the potential component without hysteresis and H ZA (Q), H ZB (Q) the factors for the hysteresis components. In opposition to the kinetic and ohmic components previously described, the ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... regarded as a normal-diterpenoid. The observation of the coupling constants for H-12 in 1 [δ H 5.08 dddd (J 8.9, 7.0, 2.0 and 2.0 Hz)] showed it to be an equatorial hydrogen and consequently α-orientated. Thus, ... See full document
3
J. Braz. Chem. Soc. vol.14 número1
... Aiming to contribute with simple and easy analytical methods to be used for the guaraná quality control, in this work two spectrophotometric quantitative analytical methods for catechol [r] ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... spectra were recorded using BRUKER AC 300/P, GEMINI 2000 (VARIAN), GEMINI 300 BB (VARIAN) and INOVA 500 (VARIAN) spectrometers, with TMS as internal standard and CDCl 3 as solvent. Chemical shifts (δ) are in ppm and the ... See full document
5
J. Braz. Chem. Soc. vol.14 número1
... coordinated to palladium, followed by the heterolysis of the palladium-C-8 bond and the rearrangement of the resulting carbonium ion with a cleavage of the C-2-C-3 bond and the formation[r] ... See full document
7
J. Braz. Chem. Soc. vol.14 número1
... For characterization of the three vermicompost samples (MH, SM and XA), different parameters, such as humidity, ash and total organic matter content (by thermogravimetric analysis), infr[r] ... See full document
9
J. Braz. Chem. Soc. vol.14 número1
... 5. Neumann, M. G.; Rodrigues, M. R.; Polymer 1998, 39, 1657. 6. Rodrigues, M. R.; Catalina, F.; Neumann, M. G.; J. Photochem. Photobiol. A: Chem. 1999, 127, 147; Encinas, M. V.; Rufs, A. M.; Neumann, M. G.; ... See full document
7
J. Braz. Chem. Soc. vol.14 número1
... Both nitrene insertion reaction from vinylazide and reductive cyclization from o - β - dinitrostyrene were efficient in the construction of the indole heterocyclic ring. The regulatory [r] ... See full document
5
J. Braz. Chem. Soc. vol.14 número1
... The volatile oil and the hexane extract from the leaves of Porcelia macrocarpa (Warm.) R.E.. Fries, Annonaceae, were submitted to chromatographic separations.[r] ... See full document
4
J. Braz. Chem. Soc. vol.14 número1
... removed and the reaction stirred at rt for 30 min. Removal of the solvent in vacuo provided the crude acyl selenide 13. The crude acyl selenide 13 was taken up in 7 mL of dry benzene followed by addition of 0.2 mL of ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... 4. Baziad, A.; Pache, T.; First Consensus Meeting on Menopause in the East Asian Region, Geneva, Switzerland, 1997; http:// matweb.hcuge.ch/matweb/bookmp/, accessed: 6 August 2001. 5. Kustritz, M. V. R. In Recent ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... 1.2 kg of the dried roots was extracted with MeOH (6L). The methanolic extract was concentrated to 200 mL. At that point 400 mg of colourless crystals of mannitol were separated out of the solution. The concentrated ... See full document
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J. Braz. Chem. Soc. vol.14 número1
... Observing the polarization curves of uncoated aluminum alloy 2024-T3 and those with PAni coating in Figure 2, a galvanic contact can be seen at –0.530 V, between the bare alloy and the g[r] ... See full document
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