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The synthesis of new 1,2,4‐ and 1,3,4‐oxadiazole derivatives as potential nonpeptide angiotensin II receptor antagonists is described. The quinoxalinone systems used as the “northern moiety” in these compounds were alkylated through a liquid/liquid phase‐transfer catalysis protocol, with good yields and high nitrogen‐ to oxygen‐alkylated product (N/O) ratios. 相似文献
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Marciela Scarpellini Ademir Neves Adailton J. Bortoluzzi Antnio C. Joussef 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(4):356-358
In the title mononuclear complex, [Cu(C5H9N3)(C10H15N5)](ClO4)2, the CuII centre is surrounded by two N‐donor ligands, which impose a square‐pyramidal environment on the metal. The new tridentate ligand [2‐(imidazol‐4‐yl)ethyl][(1‐methylimidazol‐2‐yl)methyl]amine (HISMIMA) lies in the basal plane, while the histamine ligand occupies the apical and one of the basal positions around the CuII ion. 相似文献
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Fisher Douglas B. Espidel Joussef Huerta Marlene Randall Leslie Goldman Jon 《Transport in Porous Media》1999,35(2):189-204
The purpose of this work is to present the results of the phase behavior study for a live heavy oil during a pressure depletion process using magnetic resonance imaging (MRI) as a tool to characterize foamy oil phenomena. The experiments were carried out in the pressure range of 13.1 to 1.4MPa. Signal intensity images were obtained at each pressure and with respect to time, that is, approximately for a total time of 3h after each pressure change. It is possible to see a variation in intensity across the sample. These changes can be associated with changes in mobility as well as segregation of the oil. It was also possible to observe that what we trust is the formation of gas channels at the last two pressure values, as it comes out of solution. A correlation between the transverse relaxation time T2 and temperature was established with the aim of producing one between T2 and viscosity. In this way viscosity maps for the live oil were obtained as a function of pressure and time. It was observed that above the bubble point, the viscosity maps varied from low to high to low with respect to time for the same pressure. Below the bubble point the situation is reverse. The viscosity map changes from high to low to high with respect to time for the same pressure. The study shows the potential use of MRI to follow viscosity changes during pressure depletion test in a PVT MRI cell. 相似文献
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Nicoleti CR Garcia DN da Silva LE Begnini IM Rebelo RA Joussef AC Machado VG 《Journal of fluorescence》2012,22(4):1033-1046
Two 1,8-naphthyridines were synthesized and found to be fluorescent in solution. These compounds were studied in the presence of Cu(+) and Cu(2+) ions and it was verified that the metal causes the quenching of their fluorescence emission, due to the formation of complexes between the naphthyridine and the metal. A displacement assay was carried out in a DMSO-water mixture with the addition of various anions to the solutions of the complexes, and it was observed that these systems have a high capacity to selectively detect cyanide. 相似文献
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Adailton J. Bortoluzzi Antonio C. Joussef Luiz E. Silva Ricardo A. Rebelo 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(1):o1-o3
The title compound, C11H2Cl5N3O, crystallizes in the monoclinic system with two molecules in the asymmetric unit. The molecules are chemically identical but have different structural parameters. In the three‐dimensional packing, the molecules are arranged in dimers that are connected by slipped π–π stacking, and these dimers are connected to one another through several C—H·O and Cl·Cl interactions. 相似文献
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Emerson MeyerAntonio C Joussef Hugo Gallardo Adailton J BortoluzziRicardo L Longo 《Tetrahedron》2003,59(51):10187-10193
Intramolecular nonbonded interactions have been observed in the crystalline structures of 6-ethoxy-2-trifluoroacetyliminobenzothiazoline (4) (S?O close contact) and 6-ethoxy-2-trifluorothioacetyliminobenzothiazoline (5) (S?S close contact). Density functional B3LYP/6-311G∗∗ calculations were performed for all conformers and tautomers of 4 and 5 in order to explain the preference for the S?O and S?S close contact structures. The calculations agree with the observed crystallographic structures only when solvent effects are included via a continuum model, thus showing the importance of the solvent effects to establish the correct relative energies. 相似文献
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Marcos A. De Brito Adailton J. Bortoluzzi Alessandra Greatti Augusto S. Ceccato Antnio C. Joussef Sueli M. Drechsel 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):1188-1190
The binuclear cation of the title compound, [Ni2(C33H29N4O3)(H2O)4]C2H3O2·C3H7NO·0.75H2O, was synthesized as a model for the active site of urease. Two tridentate halves of the symmetrical 2,6‐bis{[(2‐hydroxyphenyl)(2‐pyridylmethyl)amino]methyl}‐4‐methylphenolate (BPPMP3?) ligand are arranged in a meridional fashion around the two NiII ions, with the phenoxo O atom bridging the NiII ions. The cation has an approximate twofold rotation axis running through the C—O bond of the bridging phenolate group. Four water molecules complete the octahedral environment of each NiII ion. 相似文献
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Luiz Everson Da Silva Paulo Teixieira De Sousa Jr. Antonio Carlos Joussef 《合成通讯》2013,43(8):1378-1388
The reactions of 2-amino-8-hydroxyquinoline and 2-amino-4(1H)quinolone with different sulfonyl chlorides have been investigated. The chemoselectivity was observed to afford exclusively the arylsulfonate ester derivatives. The mechanism of the reaction is also discussed. 相似文献
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