[PDF] Top 20 J. Braz. Chem. Soc. vol.16 número3B
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J. Braz. Chem. Soc. vol.16 número3B
... A solução encontrada pela Natureza foi simplesmente deixar que as moléculas sejam guiadas pela própria afinidade química para gerar sistemas organizados, encontrando dessa forma suas pró[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... 1. Ghosh, A. K.; Nagar, P. K.; Sircar, P. K.; J. Plant Physiol. 1985, 120, 381; Grice, A. C.; Weed Sci. 1998, 46, 467; Abbas, M. F.; Fandi, B. S.; J. Sci. Food Agric. 2002, 82, 1472; Tschesch, R.; Wilhelm, ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... 1. Murray, R. D. H.; Mendez, J.; Brown, S. A.; The Natural Coumarins: Occurrence, Chemistry and Biochemistry; Wiley: New York, 1982; Maes, C. M.; Steyn, P. S.; J. Chem. Soc., Perkin Trans. 1 ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... Compound 1 (20.0 mg), Me 2 SO 4 (0.19 mL), dry Me 2 CO (2.0 mL) and K 2 CO 3 (0.2 g) were heated under reflux for 2 h. After removal of the inorganic salts with H 2 O, the solution was dried over Na 2 SO 4 and ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... The performance of a tungsten coil atomizer atomic absorption spectrometer with a D 2 lamp continuum source, a Czerny-Turner monochromator, and a charge coupled device detector was eval[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... were confirmed such as 2 α and 3β based on the value of the coupling constants, which were indicative of two trans- diaxial couplings [H-2 β/H-3α (J 9.6 Hz) and H-2β/H-1α (J 11.7 Hz)] and one ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... 4. Bakuzis, P.; Bakuzis, M. L. F.; Weingartner, T. F.; Tetrahedron Lett. 1978, 2371; Crumbie, R. L.; Nimetz, J. S.; Mosher, H. S.; J. Org. Chem. 1983, 47, 4040; Corey, E. J.; Vlattas, I.; ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... N,N,N’,N’ -tetrabromo-benzene-1,3-disulfonylamide [TBBDA] was reacted with semicarbazones and converts them to their corresponding carbonyl compounds in excellent yields under solvent-fr[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... All the analytical standards used in this work were obtained from Chem Service (West Chester, PA, USA) with purity around 99%. The stock and working solutions were prepared in HPLC grade acetonitrile as solvent, ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... two doublets corresponding to an AB system with J 15.9 Hz, characteristics of trans double bond (1), and J 12.8 Hz for the cis compound (3). The H-10 proton doublet, δ 7.21 for compound 1, is shifted to ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... The present paper deals with the reaction of oxidative dimerization of the H[Ru(III)Cl 2 (H 2 EDTA)].4.5 H 2 O complex on the surface of silica gel functionalized (SF) with [3- (2-aminoe[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... evidenced by two anomeric carbon signals at G 105.7 and 102.0 correlated with the proton signals at G 4.41 (d, J 7.2 Hz) and 5.36 (d, J 1.3 Hz), respectively, in the HMQC spectrum. To determine the identity ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... a metallporphyrin, in most of the cases, the four banded spectrum collapses into an essentially two-banded one in visible region, whereas the soret may remain in the usual range or shifted to higher or lower energy ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... The aim of this study was to analyze the activity of eight coumarins isolated from different plant species on the development of the symbiotic fungus of the leaf-cutting ant Atta sexden[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... continuation of our interest in exploring new reactions on epoxides catalyzed with bismuth (III) salts, and due to the lack of any report on the ring opening of oxiranes with disulfides [r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... methyl, one methylene, six methine and five quaternary carbons. The assignments were based on HMQC and HMBC spectra. The α-orientation of the methyl group at C-11 was established based on its nOe interactions with H-7 ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... Bi(OTf) 3 or Bi(TFA) 3 Catalyzed Efficient, Regio- and Chemoselectively Synthesis of βββββ -Hydroxy. Thioethers from Aryl Disulfides in the Presence of Zinc Powder[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B en a01v163b
... By merging into the nanosciences, dramatic changes of paradigm are already taking place in Physics, Chemistry, Biology, Medicine, Electronics and Materials Science, extrapolating the lim[r] ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... Erlenmeyer flasks (300 mL) containing 100 mL of sterile medium (composition: 2.0% glucose, 0.5% peptone, 0.3% yeast extract and 0.3% KH 2 PO 4 , pH adjusted to 5.7) were inoculated with fresh fungal suspension. ... See full document
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J. Braz. Chem. Soc. vol.16 número3B
... studies on analytical methods for the analysis of both natural and industrialized coconut water are still important. ICP OES is and excellent technique for fast and accurate determinations of macro and microconstituents ... See full document
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