Tag: M.W:100-200

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Quality Control of Quinoxaline-2,3(1H,4H)-dione, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 15804-19-0, Name is Quinoxaline-2,3(1H,4H)-dione, molecular formula is C8H6N2O2

The formation of overlooked compounds in the reaction of methyl amine with the diethyl ester of o-phenylenebis(oxamic acid) in MeOH

The treatment of the diethyl ester of o-phenylenebis(oxamic acid) (opbaH2Et2) with 2/3 of an equivalent of MeNH2 in MeOH does not result in the formation of the methyl ester of o-phenylene(N?-methyloxamide)(oxamic acid) (opooH3Me, 1) in pure state, as reported previously. The colourless crude material formed by this reaction was confirmed to be composed of 1 (89% content), the dimethyl ester of o-phenylenebis(oxamic acid) (opbaH2Me2, 2, 6%), 1,4-dihydro-2,3-quinoxalinedione (3, 3%) and o-phenylenebis(N?- methyloxamide) (opboH4Me2, 4, 1%), respectively. The identities of 1-4 have been verified by IR, 1H and 13C NMR spectroscopy as well as elemental analysis. In addition, the solid state structures of 1 and 2¡¤2DMSO, respectively, were determined by single-crystal X-ray diffraction studies. Successive recrystallization of the crude material from MeOH and MeOH : THF (1 : 1), respectively, does not give pure 1, but a mixture of 1 and 2. It is shown further that out of this mixture pure bis(oxamato) complexes cannot be obtained, as previously reported. Instead, treatment of the mixture with NiII or CuII salts, followed by the addition of [nBu4N]OH, results in the formation of two mixtures of [nBu4N]2[Ni(opba)] (5) and [nBu4N]2[Ni(opooMe)] (6) as well as [nBu4N]2[Cu(opba)] (7) and [nBu 4N]2[Cu(opooMe)] (8), respectively. The simultaneous formation of 5/6 and 7/8, respectively, has been verified by crystallization of the obtained mixtures and X-ray diffraction studies of the obtained single crystals. Co-crystallization of mixtures of 5/6 (99 mass%) and 7/8 (1 mass%), respectively, results in the formation of single-crystals of diamagnetically diluted 7 in the host lattice of 5 (7@5) accompanied by single-crystal formation of diamagnetically diluted 8 in the host lattice of 6 (8@6), as verified by EPR spectroscopy. It is finally shown that the ethyl ester of o-phenylene(N?- methyloxamide)(oxamic acid) (opooH3Et, 9), a homologue of 1, can be obtained in pure state by the treatment of opbaH2Et2 with 5/6 of an equivalent of MeNH2 in EtOH. The Royal Society of Chemistry 2013.

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Quinoxaline | C8H6N286 | ChemSpider

Related Products of 18514-76-6, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.18514-76-6, Name is 5-Nitroquinoxaline, molecular formula is C8H5N3O2. In a Article£¬once mentioned of 18514-76-6

Synthesis of 2-substituted indoles via Pd/C-catalyzed reaction in water

A general and one-pot synthesis of 2-alkyl/aryl substituted indoles via a tandem Pd/C mediated coupling/5-endo-dig cyclization of terminal alkynes (including acetylenic carbinols) with o-iodoanilides in water is reported. The reaction is carried out using PPh3 and CuI as co-catalysts and 2-aminoethanol as a base. The reaction appears to tolerate a variety of functional groups present in the alkynes and does not require the use of any organic co-solvent.

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Quinoxaline | C8H6N889 | ChemSpider

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

Iron-catalyzed Minisci acylation of N-heteroarenes with alpha-keto acids

An efficient and mild protocol has been developed for the Minisci acylation reactions of nitrogen-containing heteroarenes with alpha-keto acids. Distinct from the conventional Minisci acylation conditions, the chemistry was performed using non-noble metal Fe(II), instead of expensive Ag(I) salt, as catalyst. A wide range of substrates, including aliphatic or aromatic alpha-keto acids, as well as various N-heteroarenes, proved to be compatible with the protocol. Scale-up experiment also demonstrates the practicality of the approach.

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Quinoxaline | C8H6N716 | ChemSpider

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Recommanded Product: 2,3-Dichloroquinoxaline, 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

Synthesis, structure elucidation and antibacterial evaluation of new steroidal -5-en-7-thiazoloquinoxaline derivatives

Some heterocyclic systems namely cholest-5-en-7-thiazolo[4,5-b]quinoxaline-2-yl-hydrazone] were synthesized by the reaction of cholest-5-en-7-one-thiosemicarbazone with 2,3-dichloroquinoxaline at 80 C in high yield. The thiosemicarbazone derivatives were obtained by the condensation of the thiosemicarbazide with steroidal ketones. All the compounds have been characterized by means of elemental analyses, IR, 1H NMR and mass spectroscopic data. The in vitro antibacterial activity was evaluated by disk diffusion method and then the minimum inhibitory concentration (MIC) of compounds was determined against the culture of Escherichia coli. The results were compared with the standard drug chloramphenicol. The results showed that compounds 7 and 8 are better antibacterial agents as compared to chloramphenicol.

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Quinoxaline | C8H6N1400 | ChemSpider

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. name: Quinoxaline-2,3-diamine, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 6640-47-7, name is Quinoxaline-2,3-diamine. In an article£¬Which mentioned a new discovery about 6640-47-7

Chemical and electrochemical reduction of pyrazino<2,3-b>quinoxalines

The hydrogenation of 2,3-dimethylpyrazino<2,3-b>quinoxaline 1 and 2-phenylpyrazino<2,3-b>quinoxaline 2 leads to the corresponding 5,10-dihydroderivatives 3b and 4b.LiAlH4 reduction of 2, of 2,3-dimethyl-6,7-diphenylpyrazino<2,3-b>pyrazine 8 and 2,6,7-triphenylpyrazino<2,3-b>pyrazine 9 furnishes the corresponding 1,2,3,4-tetrahydroderivatives 7, 10 and 11.NaBH4 reduction of 2 leads to a mixture of 4b and 7.In hydroorganic medium 1 and 2 are electrochemically reduced to 3b and 4b with which they form a redox system.

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Quinoxaline | C8H6N252 | ChemSpider

Electric Literature of 6639-87-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.6639-87-8, Name is 6-Nitroquinoxaline, molecular formula is C8H5N3O2. In a Article£¬once mentioned of 6639-87-8

Nucleophilic vinylic substitution (SNV) of activated alkoxymethylene derivatives with 6-aminoquinoxaline

Treatment of 6-aminoquinoxaline with beta,beta-diactivated alkoxymethylene derivatives gave the corresponding N-(quinoxalin-6-yl)enamines. A variant of the SNV reaction mechanism was proposed for substitution of the alkoxymethylene compounds, on the basis of the structures of the precursor enol ether and the vinylic substitution product and on computations. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N966 | ChemSpider

1448-87-9, Name is 2-Chloroquinoxaline, belongs to quinoxaline compound, is a common compound. category: quinoxalineIn an article, once mentioned the new application about 1448-87-9.

Cross-coupling of cyclopropyl- and cyclobutyltrifluoroborates with aryl and heteroaryl chlorides

(Chemical Equation Presented) Suitable conditions were found for the Suzuki-Miyaura cross-coupling reaction of potassium cyclopropyl-and cyclobutyltrifluoroborates with aryl chlorides. Both of these secondary alkyl trifluoroborates coupled in moderate to excellent yield with electron-rich, electron-poor, and hindered aryl chlorides to give a variety of substituted aryl cyclopropanes and cyclobutanes.

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Quinoxaline | C8H6N636 | ChemSpider

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, 15804-19-0, name is Quinoxaline-2,3(1H,4H)-dione, introducing its new discovery. Application In Synthesis of Quinoxaline-2,3(1H,4H)-dione

Convergent functional groups. 9. Complexation in new molecular clefts

Two new 2,7-di-tert-alkyl-9,9-dimethylxanthene-4,5-dicarboxylic acids are prepared as organic soluble, U-shaped modules for the construction of molecular hosts. Condensation of two diacid units with spacers (e.g., hydroquinone, 4,4?-biphenol, and 2,6-diaminonaphthalene) gives large structures capable of assuming cleftlike shapes that complex sizable guests such as DABCO, quinine, quinidine, and quinoxaline-2,3-dione. The xanthene diacids and their derivatives are shown to contain intramolecular hydrogen bonds that organize the binding sites and modify their chemical properties.

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Quinoxaline | C8H6N367 | ChemSpider

Synthetic Route of 18514-76-6, 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, 18514-76-6, 5-Nitroquinoxaline, introducing its new discovery.

Rhodium-catalyzed NH-indole-directed ortho C?H coupling of 2-arylindoles with diazo compounds via metal carbene migratory insertion

A high regioselective rhodium-catalyzed ortho C?H coupling of 2-arylindoles with diazo compounds via NH-indole-directed C?H bond activation has been developed. The catalytic reaction features mild reaction conditions, broad substrate scope and good functional group tolerability.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Synthetic Route of 18514-76-6. In my other articles, you can also check out more blogs about 18514-76-6

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Quinoxaline | C8H6N854 | ChemSpider

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, name: 2,6-Dichloroquinoxaline, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 18671-97-1, Name is 2,6-Dichloroquinoxaline, molecular formula is C8H4Cl2N2

13C-NMR Study of 4H-1,3,4-Thiadiazino[5,6-b]quinoxalines. A Proof for the N5-Deuteration in Deuteriotrifluoroacetic Acid

The carbon signals of the 2-acylamino-4H-1,3,4-thiadiazino[5,6-b]quinoxalines 1a,b, 2-acylamino-4H-1,3,4-thiadiazino[5,6-b]quinoxaline 1,1-dioxides 2a,b, and 2-amino-4H-1,3,4-thiadiazino[5,6-b]quinoxaline 3 in deuteriodimethyl sulfoxide and in deuteriotrifluoroacetic acid were assigned by the nmr (HMBC, HMQC) spectroscopy. The comparison of the carbon chemical shifts in deuteriodimethyl sulfoxide with those in deuteriotrifluoroacetic acid clarified that compounds 1a, 1b, and 3 were deuterized at the N5-position in deuteriotrifluoroacetic acid, while the 1,1-dioxides 2a,b did not undergo the N5-deuteration in deuteriotrifluoroacetic acid.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N1670 | ChemSpider