[PDF] Top 20 J. Braz. Chem. Soc. vol.12 número1
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J. Braz. Chem. Soc. vol.12 número1
... Este número do Journal of the Brazilian Chemical Society marca nossa entrada em um novo Milênio. Ainda que esta efeméride seja um tanto arbitrária, e que o Journal só tenha existido durante os últimos anos do milênio ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... Fosfatidilcolinas diacetilênicas são compostos análogos aos fosfolipídios naturais. Tais moléculas podem ser hidratadas formando agregados em bicamadas denominados lipossomas, de maneira semelhante às fosfatidilcolinas ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... The PQC was obtained from a commercial electronic component (ABC-Xtal Microeletrônica, Rio de Janeiro, Brazil) with 3.579545 MHz series resonance frequency. This PQC is easy to find because it is commonly used in color ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... 104.8 (C-2) allowed an unequivocal assignment of the A ring in the xanthone moiety. In the B ring, the deshielded signal of H-8 at δ 7.75 indicated a periplanar relation with the carbonyl. The long range correlations of ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... The retention of these metals by the humic frac- tion of Barra Bonita sediment denotes their strong associa- tion with some sites of the natural organic matter. The pres- ence of Cu and [r] ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... Next, III is the first three-dimensional structure, and shows a trigonal bipyramidal geometry. At the SCF level, it is found at 58.86 kcal/mol above I, and corresponds to the third most stable isomer, whereas at the MP2 ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... the total Hg concentration at the upper portion of the estuarine gradient are strongly bound to organic matter and/or suspended particles 8,9,10,11 . This characteristic may result in lower bioavailability and more ... See full document
6
J. Braz. Chem. Soc. vol.12 número1
... The combination of M-TDSC and SAXS can provide much more information about the morphology of structured latices in that the weight fraction of interface in structured latices can, additi[r] ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... Other favorable features such as a throughput of 40 determinations per hour, a relative standard deviation of 0.8 % (n=10) for an iron manganese sample solution with 2.20 mg L -1 P, a l[r] ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... The gas-phase acidity of nine carbon acids of the form CH 3 Z (nitromethane, acetophenone, dimethylsulfone, acetaldehyde, butanone, acetone, methyl acetate, acetonitrile and dimethylsulf[r] ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... sonication process. For this study, up to 9 tubes were placed in the positions specified in Figure 1. According to Tables 5 and 6, a decrease in the absorbance was obtained (ca. 5 and 12 times in the absorbance ... See full document
7
J. Braz. Chem. Soc. vol.12 número1
... Epoxides were obtained in 10-65% yields with nitriles 1a, 1c-f (entries 1-2, 6-13, Table 1) using methanol as solvent. Trichloroacetonitrile (1b) did not furnish epoxides or amide in methanol. In this case, methyl ... See full document
5
J. Braz. Chem. Soc. vol.12 número1
... Air-dried powdered leaves of P. alata (750 g) were ex- tracted by maceration in EtOH (plant:solvent, 1:10, w/v) (2 x 10 days). After evaporation of the ethanolic extract, the gummy residue was suspended in H 2 O (500 mL) ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... Trialkyltin radicals can promote intramolecular cyclization of acylsilanes 53-55 with alkyl, aryl and vinyl radicals, affording cyclopentyl silyl ethers 56 and 57 and enol silyl ether 58[r] ... See full document
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J. Braz. Chem. Soc. vol.12 número1
... Total arsenic, arsenite, arsinate and dimethylarsinic acid (DMA) were selectively determined in natural waters by hydride generation – atomic absorption spectrometry, using sodium tetrah[r] ... See full document
5
J. Braz. Chem. Soc. vol.12 número1
... was purged with gaseous ethylene and the reaction temperature was controlled by an external circulation bath. When the reaction temperature was attained, the amount of DEAC solution was injected under ethylene atmosphere ... See full document
5
J. Braz. Chem. Soc. vol.12 número1
... The regioselectivity found in the mild basic hydrolysis of the 2,5-dimethyl-1,4-naphthohydroquinone diacetate (Nunes, R.L.; Bieber, L.W.; Longo, R.L. J. Nat. Prod. 1999, 62, 1600) has been studied with ab initio ... See full document
5
J. Braz. Chem. Soc. vol.12 número4
... 10. For similar intramolecular Diels-Alder approaches, see: (a) Burke, S. D.; Piscopio, A. D.; Kort, M. E.; Matulenko, M. A.; Parker, M. H.; Armistead, D. M.; Shankaran, K. J. Org. Chem. 1994, 59, 332; (b) ... See full document
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J. Braz. Chem. Soc. vol.12 número6
... Perpendicular EPR spectra region (300 K) for lower ash contents humic acid (HAr) samples (see text) extracted from sheep (SHHAr), cow (COHAr), goat (GOHAr) and rabbit (RAHAr) vermicompos[r] ... See full document
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J. Braz. Chem. Soc. vol.12 número5
... On the other hand, chiral crown ether 4 combined with Ln(OTf) 3 was found to be effective. For example, when 4 (12 mol %) and Pr(OTf) 3 (10 mol %) were used, the reaction of benzaldehyde with silyl enol ether 5 in ... See full document
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