Heterocyclic Compounds
Mostrando 13-24 de 104 artigos, teses e dissertações.
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13. EXPERIMENTAL AND THEORETICAL ANALYSIS OF NA OXAZINOQUINOXALINE DERIVATIVE FOR CORROSION INHIBITION OF AISI 1018 STEEL
The inhibitory ability of an oxazinoquinoxaline derivative (OAQX) against the corrosion of AISI 1018 mild steel induced by aqueous 0.6 mol L-1 NaCl solution is herein evaluated. Linear polarization resistance studies showed the inhibitory efficiency of OAQX varying from 62.75% to 75.93% with OAQX concentration ranged from 0.259 x 10-4 mol L-1 to 3.243 x 10-4
Quím. Nova. Publicado em: 2018-03
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14. Hirshfeld Surfaces and Nonlinear Optics on Two Conformers of a Heterocyclic Chalcone
Heterocyclic chalcones have been prominent in the scientific community due to various biological activities reported for these compounds. The structural knowledge of heterocyclic chalcones can help in the understanding of their mechanism of action. The Hirshfeld surfaces were used to study the supramolecular arrangement of two conformers present into asymmet
J. Braz. Chem. Soc.. Publicado em: 2018-02
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15. Rare Earth-Indomethacinate Complexes with Heterocyclic Ligands: Synthesis and Photoluminescence Properties
In this work, synthesis, characterization and photophysical properties of trivalent rare earth complexes with a nonsteroidal anti-inflammatory drug [the indomethacinate (indo), presenting formulas RE(indo)3(H2O)x (x = 3, for Eu3+ and Gd+3, and x = 4 for Tb+3), RE(indo)3(bipy) and RE(indo)3(phen) (bipy: 2,2'-bipyridine, and phen: 1,10-phenanthroline)] were in
J. Braz. Chem. Soc.. Publicado em: 2017-12
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16. Lipophilicity Study of 1-(Benzofuran-2-yl)ethan-1-one Oxime and its Substituted O-Benzyl Ethers
Heterocyclic oxime ethers play a significant role in organisms due to their biological activity. Lipophilicity is an important parameter that may affect biological activity of the compounds 1-(benzofuran-2-yl)ethan-1-one oxime and its nine biologically active ethers. The relationship between the structure and lipophilicity parameters (log kw values) of the t
J. Braz. Chem. Soc.. Publicado em: 2017-11
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17. SÍNTESE DE DERIVADOS DE FENANTRIDINONAS POR ARILAÇÃO DIRETA. CARACTERIZAÇÃO DOS ESPECTROS DE ABSORÇÃO E EMISSÃO DE EXEMPLOS REPRESENTATIVOS
The phenanthridinone heterocyclic system has attracted considerable attention in recent years due to the diverse array of physical, chemical and pharmacological properties demonstrated by natural and synthetic derivatives. As a consequence there has been considerable development of synthetic methodology for the synthesis of this and related heterocyclic ring
Quím. Nova. Publicado em: 2016-04
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18. 7-Chloroquinoline-1,2,3-triazoyl Carboxylates: Organocatalytic Synthesis and Antioxidant Properties
We describe herein our results on the synthesis and antioxidant properties of 7-chloroquinoline-1,2,3-triazoyl-4-carboxylates. This class of compounds have been synthesized in moderated to excellent yields by the reaction of 4-azido-7-chloroquinoline with a range of β-ketoesters in the presence of a catalytic amount of pyrrolidine (10 mol%). The synthesized
J. Braz. Chem. Soc.. Publicado em: 2016-01
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19. Degradation of organic pollutants and characteristics of activated sludge in an anaerobic/anoxic/oxic reactor treating chemical industrial wastewater
A laboratory-scale anaerobic/anoxic/oxic system operated at the hydraulic retention times (HRT) of 20, 40, and 60 h with mixed liquor suspended solids (MLSS) concentrations of 3 g/L and 6 g/L was considered for treating chemical industrial wastewater rich in complex organic compounds and total dissolved solids. Extending the HRT and increasing the MLSS conce
Braz. J. Chem. Eng.. Publicado em: 2014-09
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20. Flavonoid electrochemistry: a review on the electroanalytical applications
Flavonoids are polyphenolic compounds widespread in vegetal kingdom. They present a C-15 skeleton, which is divided into three units A, B and C. Unit C is an oxygen containing heterocyclic, whose oxidation state and saturation level define major subclasses. Units A and B are aromatic rings, in which four major types of substituents, i. e. hydroxyl, methoxyl,
Rev. bras. farmacogn.. Publicado em: 10/05/2013
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21. Planejamento, síntese e avaliação da atividade anti-T. cruzi de derivados furfurilidênicos com estruturas azometínica e oxadiazolínica / Design, synthesis, identification and anti-Trypanosoma cruzi activity evaluation of furfurylidene azomethine and oxadiazole derivatives
The search for alternative therapies for the treatment of Chagas disease presents great importance, since there are only two currently available drugs, nifurtimox and benznidazole. Both have considerable adverse effects and, in Brazil, is used only benznidazole. Nitro-heterocyclic compounds with activity against Trypanosoma cruzi, the causative agent of Chag
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/06/2012
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22. Estudo da estrutura eletrônica de compostos mesoiônicos
Mesoionic compounds are a class of molecules which have attracted the interest of scientific community since the late nineteenth century. Their unique structure has proved to be a challenge for researchers who intended to satisfactorily describe and define it. Those compounds are five-membered heterocyclic rings which possess a delocalized structure
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/09/2011
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23. Funcionalização de cumarinas via reação de acoplamento de Suzuki-Miyaura de sais de organotrifluoroboratos de potássio / Functionalization of coumarins by Suzuki-Miayura cross-Coupling of potassium organotrifluoroborate salts
As cumarinas são compostos com potente atividade biológica. Foi explorada sua funcionalização, iniciando pela sua bromação, gerando o composto 3-bromocumarina, utilizado como material de partida para as reações de acoplamento do tipo Suzuki-Miyaura, que são uma das reações mais empregadas para a formação de ligação carbono-carbono, a qual util
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/04/2011
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24. Isoxazolinas: uma classe de materiais avançados revisitada
The synthesis and characterization of novel series of liquid crystalline materials containing N-heterocyclic isoxazoline are described. These molecules were obtained from the reaction of 1,3-dipolar cycloaddition of nitrile oxides to different compounds containing double bonds. Thermal properties were analyzed by MOLP, DSC and TGA, and optical properties by
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010