Category: 17056-99-4

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Carbon-13 NMR Studies on some 5-Substituted Quinoxalines

Eleven 5-substituted quinoxalines (NO2, NH2, COOH, OCH3, CH3, OH, F, Cl, Br, I, CN, the latter five not reported previously) have been synthesized by standard methods.Their 13C NMR spectra have been measured in DMSO-d6 and assigned on the basis of substituent parameters, by line widths and by intensities.The chemical shifts compare favorably with those calculated using benzene substituent parameters, and are very close to those of corresponding carbons in 1-substituted phenazines.The correlation with the chemical shifts of the corresponding positions in 1-substituted naphthalenes is also close except for those of carbons 4a and 8a in the quinoxalines which, due to their proximity to nitrogen, are downfield (in some cases 12 ppm) of the signals of the corresponding carbons in naphthalene. 5-Fluoroquinoxaline was also measured in CDCl3, CD3COCD3, CD3CN, CD3OD, C6D6 and CD3COOD.In all solvents an abnormally low 2J(CF) (ca. 12 Hz) was found for C-4a and no C-F spin-spin splitting could be detected for the three-bond coupling of C-8a.Similar abnormalities were found in 2-fluoroaniline and 2-fluoroacetanilide.There are linear relationships between the Q parameter of the substituent and the chemical shift of carbons 4a, 5 and 6.A linear relationship also exists between the chemical shift of C-8 (‘para’ position) and the Hammett ?p parameter of the substituent.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N112 | ChemSpider

Electric Literature of 17056-99-4, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.17056-99-4, Name is Quinoxalin-5-ol, molecular formula is C8H6N2O. In a article，once mentioned of 17056-99-4

Structure and Stereochemistry of cis-Dihydro Diol and Phenol Metabolites of Bicyclic Azaarenes from Pseudomonas putida UV4

Biotransformation of quinoline, isoquinoline, quinoxaline and quinazoline using growing cultures of Pseudomonas putida UV4 yielded cis-dihydro diols from the oxidation of the carbocyclic aromatic ring.Aromatic hydroxylation was observed in both carbocyclic and heterocyclic rings.Ring cleavage of the quinoline skeleton to yield anthranilic acid, and cis-diol formation (with alkene bond reduction) to yield cis-5,6,7,8-tetrahydroquinazoline-5,6-diol from quinazoline were observed.The cis-dihydro diol metabolites of quinoline (5,6- and 7,8-) and quinoxaline (5,6-) were found to be optically pure, while metabolism of isoquinoline gave on e homochiral (5,6-) and one racemic 7,8-) cis-dihydro diol product.The absolute configuration of the cis-dihydro diol metabolites have been determined using 1H NMR analyses, stereochemical correlations and X-ray crystallography methods.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N110 | ChemSpider

Synthetic Route of 17056-99-4, Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 17056-99-4, molcular formula is C8H6N2O, introducing its new discovery.

SULFONAMIDE COMPOUNDS

Certain sulfonamide compounds are dual CCK1/CCK2 inhibitors useful in the treatment of CCK1/CCK2 mediated diseases.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N103 | ChemSpider

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Phototransformations of 6-X-5-nitroquinoxalines

Photophysical properties and photochemical activity of 6-X-5- nitroquinoxalines with electron-donor substituents (X = H, CH3, Cl, OC2H5, NH2) ortho to the nitro group were studied. The quantum yield of the formation of 5-hydroxyquinoxaline from the corresponding nitro derivative depends on the nature of the substituent and irradiation conditions. Phototransformations can go through nitro-nitrite rearrangement with the participation of two alternative T(npi*) levels, depending on the size and electronic effects of the substituent. The latter factor is largely determined by the population on excitation of different charge-transfer states involving the nitro group.

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Reference£º
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N115 | ChemSpider

Reference of 17056-99-4, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.17056-99-4, Name is Quinoxalin-5-ol, molecular formula is C8H6N2O. In a Patent£¬once mentioned of 17056-99-4

Quinoxalin compd. and semiconductor material (by machine translation)

The present invention relates to chinoxaline compounds, to the use thereof, to an organic semiconductor material, to an organic light-emitting diode, to an organic thin-layer transistor, or to an organic solar cell, and to the use of such an organic semiconductor material in an electronic, optoelectronic, or electroluminescent component for increasing the long-term stability and/or improving the short-circuit strength, a pn transition, and the use of a pn transition in an electronic, optoelectronic, or electroluminescent compound.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N107 | ChemSpider

Chemistry is traditionally divided into organic and inorganic chemistry. Safety of Quinoxalin-5-ol, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 17056-99-4

Computational design, synthesis and biological evaluation of para-quinone-based inhibitors for redox regulation of the dual-specificity phosphatase Cdc25B

Quinoid inhibitors of Cdc25B were designed based on the Linear Combination of Atomic Potentials (LCAP) methodology. In contrast to a published hypothesis, the biological activities and hydrogen peroxide generation in reducing media of three synthetic models did not correlate with the quinone half-wave potential, E1/2.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N114 | ChemSpider

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Graphite-Conjugated Acids Reveal a Molecular Framework for Proton-Coupled Electron Transfer at Electrode Surfaces

Proton-coupled electron-transfer (PCET) steps play a key role in energy conversion reactions. Molecular PCET reactions are well-described by “square schemes” in which the overall thermochemistry of the reaction is broken into its constituent proton-transfer and electron-transfer components. Although this description has been essential for understanding molecular PCET, no such framework exists for PCET reactions that take place at electrode surfaces. Herein, we develop a molecular square scheme framework for interfacial PCET by investigating the electrochemistry of molecularly well-defined acid/base sites conjugated to graphitic electrodes. Using cyclic voltammetry, we first demonstrate that, irrespective of the redox properties of the corresponding molecular analogue, proton transfer to graphite-conjugated acid/base sites is coupled to electron transfer. We then show that the thermochemistry of surface PCET events can be described by the pKa of the molecular analogue and the potential of zero free charge (zero-field reduction potential) of the electrode. This work provides a general framework for analyzing and predicting the thermochemistry of interfacial PCET reactions.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N113 | ChemSpider

17056-99-4, Quinoxalin-5-ol is a quinoxaline compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

A. Diethylthiocarbamic acid O-quinoxalin-5-yl ester. ; A mixture of 5-hydroxyquinoxaline (2.13 g, 14.6 mmol), finely ground K2CO3 (4.0 g, 29 mmol), and DMF (50 mL) was stirred at 23 C. for 1 h. Solid diethylthiocarbamoyl chloride (2.439 g, 16.1 mmol) was then added. The resulting mixture was stirred for 2 h, then was diluted with water (150 mL) and extracted with Et2O (2¡Á100 mL). The combined organic extracts were washed with water (100 mL) and brine (100 mL), then dried and concentrated to a viscous orange oil, which was used without purification (3.63 g, 95%). MS (ESI+): mass calcd. for C13H15N3OS, 261.1; m/z found, 262 [M+H]+. 1H NMR (500 MHz, CDCl3): 8.85-8.65 (m, 2H), 7.96 (dd, J=8.5, 1.1, 1H), 7.71 (t, J=7.9, 1H), 7.46 (dd, J=7.6, 1.2, 1H), 3.87 (q, J=7.1, 2H), 3.78 (q, J=7.1, 2H), 1.38 (t, J=7.1, 3H), 1.28 (t, J=7.1, 3H). 13C NMR (125 MHz, CDCl3): 186.6, 149.4, 144.9, 144.5, 143.4, 137.0, 128.9, 127.0, 123.1, 48.2, 44.5, 13.1, 11.5.

17056-99-4, The synthetic route of 17056-99-4 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Allison, Brett; Phuong, Victor K.; Pippel, Marna C.W.; Rabinowitz, Michael H.; Venkatesan, Hariharan; US2006/69286; (2006); A1;,
Quinoxaline – Wikipedia
Quinoxaline | C8H6N2 | ChemSpider