Month: May 2021

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 1448-87-9, name is 2-Chloroquinoxaline, introducing its new discovery. Product Details of 1448-87-9

2-Aroylquinoxalines (5,6), 1-aroylphthalazines (10,11), and 4-aroylcinnolines (13) were synthesized by using arenecarbaldehydes (2) in the presence of an azolium salt (1) in moderate to good yields. 1,3-Dimethylimidazolium iodide (1a) and sodium sulfinate (7) were also effective catalysts in this aroylation.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N634 | ChemSpider

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. Computed Properties of C8H5ClN2. Introducing a new discovery about 1448-87-9, Name is 2-Chloroquinoxaline

A series of highly efficient red phosphorescent heteroleptic iridium(III) complexes 1-6 containing two cyclometalating 2-(2,4-substitued phenyl)quinoxaline ligands and one chromophoric ancillary ligand were synthesized: (pqx)2Ir(mprz) (1), (dmpqx)2Ir(mprz) (2), (dfpqx)2Ir(mprz) (3), (pqx)2Ir(prz) (4), (dmpqx)2Ir(prz) (5), (dfpqx)2Ir(prz) (6), where pqx = 2-phenylquinoxaline, dfpqx = 2-(2,4-diflourophenyl)quinoxaline, dmpqx = 2-(2,4-dimethoxyphenyl)quinoxaline, prz = 2-pyrazinecarboxylate and mprz = 5-methyl-2-pyrazinecarboxylate. The absorption, emission, electrochemical and thermal properties of the complexes were evaluated for potential applications to organic light-emitting diodes (OLEDs). The structure of complex 2 was also determined by single-crystal X-ray diffraction analysis. Complex 2 exhibited distorted octahedral geometry around the iridium metal ion, for which 2-(2,4-dimethoxyphenyl)quinoxaline N atoms and C atoms of orthometalated phenyl groups are located at the mutual trans and cis-positions, respectively. The emission spectra of the complexes are governed largely by the nature of the cyclometalating ligand, and the phosphorescent peak wavelengths can be tuned from 588 to 630 nm with high quantum efficiencies of 0.64 to 0.86. Cyclic voltammetry revealed irreversible metal-centered oxidation with potentials in the range of 1.16 to 1.89 V as well as two quasi-reversible reduction waves with potentials ranging from -0.94 to -1.54 V due to the sequential addition of two electrons to the more electron-accepting heterocyclic portion of two distinctive cyclometalated C^N ligands.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N732 | ChemSpider

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Recommanded Product: 2213-63-0, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 2213-63-0, name is 2,3-Dichloroquinoxaline. In an article，Which mentioned a new discovery about 2213-63-0

In this paper, we report the successful synthesis of new 2-phenyl-3-substituted furo/thieno[2,3-b]quinoxaline derivatives from 2-chloro-3-methoxyquinoxaline and 2-chloro-3-(methylthio)quinoxaline by a three-step approach. The Sonogashira coupling reaction of the title compounds with terminal alkynes afforded 2-methoxy-3-(phenylethynyl)quinoxaline and 2-(methylthio)-3-(phenylethynyl)quinoxaline in good to excellent yields. The iodocyclization of the resulting compounds using ICl in CH2Cl2 afforded 3-iodo-2-phenylfuro[2,3-b]quinoxaline and 3-iodo-2-phenylthieno[2,3-b]quinoxaline. The subsequent palladium-catalyzed Sonogashira, Suzuki, and Heck reactions of the resulting iodo compounds led to the formation of 2,3-disubstituded furo/thieno[2,3-b]quinoxaline in high yields. All compounds were fully characterized by FT-IR, mass, 1H NMR, and 13C NMR spectral data. The synthesized quinoxaline derivatives were also screened against the two bacterial strains Escherichia coli and Micrococcus luteus.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N1272 | ChemSpider

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Product Details of 2213-63-0, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 2213-63-0, Name is 2,3-Dichloroquinoxaline, molecular formula is C8H4Cl2N2

The synthesis and electropolymerisation of a new terthiophene, 1,3-di-2-thienylthieno[3?,4?:5,6][1,4]dithiino[2,3-b]quinoxaline, is reported. The compound bears a quinoxaline unit fused to the central thiophene ring via a 1,4-dithiin ring; the latter unit ensures a non-planar structure for the molecule. The corresponding polymer, prepared electrochemically, has been characterized by cyclic voltammetry and UV-vis-NIR spectroelectrochemistry. The material is oxidised within the conjugated chain, but the reduction processes are complex and arise from both the polythiophene and the independent quinoxaline units. The polymer has two distinct colour states – orange in the neutral form and green-blue in the oxidised state. Electrochromic studies on poly(1,3-di-2-thienylthieno[3?,4?:5,6][1,4]dithiino[2,3-b] quinoxaline) reveal fast switching speeds that are superior to those of poly(3,4-ethylenedioxythiophene) (PEDOT) and a colouration efficiency of 381 cm2 C-1 at 650 nm. The Royal Society of Chemistry 2007.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N1271 | ChemSpider

Reference of 6640-47-7, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, and a compound is mentioned, 6640-47-7, Quinoxaline-2,3-diamine, introducing its new discovery.

The reactions of imidazoquinoxaline and 1,3,5-H3btc acid under different condition have been investigated. The different degree of hydrolysis reaction leads to two different adducts being produced, namely, [(HdiamQuin)+(H2btc)-] (1), and [(diamQuin)4(ImiQuin)·4H2O] (2). Both compounds were characterized by X-ray crystallography. Crystal data for 1: monoclinic, space group Pn with a = 9.868(2), b = 5.3172(11), c = 15.387(3) A, beta = 91.10(3), C17H14N4O6, Mr = 370.32, V = 807.2(3) A3, Z = 2, Dc = 1.524 g/cm3, mu(MoKalpha) = 0.118 mm-1, F(000) = 384, the final R = 0.0385 and wR = 0.0869 for 2294 observed reflections (I > 2sigma(I)). Crystal data for 2: triclinic, space group P-1 with a = 9.825(2), b = 14.144(3), c = 16.054(3) A, alpha = 101.06(3), beta = 102.55(3), gamma = 92.46(3), C44H40N20O4, Mr = 912.96, V = 2128.8(7) A3, Z = 2, Dc = 1.424 g/cm3, mu(MoKalpha) = 0.099 mm-1, F(000) = 952, the final R = 0.0554 and wR = 0.1662 for 6563 observed reflections (I > 2sigma(I)). X-ray diffraction analysis reveals that compound 1 is a salt. Imidazoquinoxaline was wholly hydrolyzed into 2,3-diaminoquinoxaline and protonated as a cation with H2btc- acting as an anion. However, in compound 2, the imidazoquinoxaline is only partly hydrolyzed, and the resulting 2,3-diaminoquinoxaline forms adduct with the intacted imidazoquinoxaline. Both are further aggregated into 3D frameworks by strong hydrogen bonding even pi-pi interactions.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N264 | ChemSpider

Electric Literature of 16915-79-0, 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.16915-79-0, Name is 2-(Hydroxymethyl)-3-methylquinoxaline 1,4-dioxide, molecular formula is C10H10N2O3. In a article，once mentioned of 16915-79-0

The invention belongs to veterinary medicine, pharmaceutical field of feed additive, to provide a derivative-quinocetone sodium quinocetone [3-methyl-2 – (2-sulfonic acid sodium benzene b thin keto ) quinoxaline -1,4-dioxide] synthetic method. If the chemical structural formula of the compound shown in the Figure, is made up of mequindox and 2- formyl benzene sulfonic acid sodium Claisen-schumidt under the alkaline condition is obtained through condensation reaction. The operation step of this invention: in is provided with a stirring device in the reaction container, adding ethanol, 2- formyl benzene sodium sulfonate, mequindox, sodium carbonate, stirred and heated up to 40-60C, reaction 4-8 hours later, to take advantage of heat filter, a small amount of ethanol washing the filter cake to white, the majority of the solvent, the spin vaporization of the filtrate, sodium sulfonate quinocetone placed sleepovers separated, filtered, washing the filter cake by ethyl acetate, a small quantity of water not only re-crystallization. The product is a pale yellow powder, it is easy to dissolve in water, soluble methanol, ethanol, soluble in acetone, chloroform, is not soluble in ethyl acetate. (by machine translation)

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N1723 | ChemSpider

Reference of 1448-87-9, 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.1448-87-9, Name is 2-Chloroquinoxaline, molecular formula is C8H5ClN2. In a article，once mentioned of 1448-87-9

The present invention relates to amino-substituted isothiazoles of general formula (I) : in which A, R1 and R2 are as defined in the claims, to methods of preparing said compounds, to intermediate compounds useful for preparing said compounds, to pharmaceutical compositions and combinations comprising said compounds and to the use of said compounds for manufacturing a pharmaceutical composition for the treatment or prophylaxis of a disease, in particular of neoplasms, as a sole agent or in combination with other active ingredients.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N454 | ChemSpider

Chemistry is traditionally divided into organic and inorganic chemistry. Quality Control of 3,4-Dihydroquinoxalin-2(1H)-one, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 59564-59-9

A general, straightforward, and practical access to multi-substituted chiral quinoxalin-2-ones has been achieved based on the copper(I) chloride-dimethylethylenediamine (DMEDA) catalyst system. With the use of 1 mol% copper(I) chloride, structurally diverse quinoxalin-2-ones were generated with high optical purity from readily available starting materials, 2-haloanilines and alpha-amino acids, in a one-pot manner.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N189 | ChemSpider

Related Products of 49679-45-0, 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, 49679-45-0, molcular formula is C11H9ClN2O2, introducing its new discovery.

The present invention discloses compounds of Formula (I), or pharmaceutically acceptable salts, esters, or prodrugs thereof: which inhibit Respiratory Syncytial Virus (RSV). The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from RSV infection. The invention also relates to methods of treating an RSV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N1881 | ChemSpider

Electric Literature of 18514-76-6, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 18514-76-6, Name is 5-Nitroquinoxaline,introducing its new discovery.

One-pot, four-step syntheses of indoles using both solid-supported heterogeneous and homogeneous palladium catalysts and reagents were carried out. Such a combination of these two-phase catalysts and reagents causes a dramatic increase in yield, and it is a simple process. The presented methodology is effective for four-step reactions to provide various functionalized indoles.

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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N902 | ChemSpider