Category: 14508-49-7

14508-49-7, Name is 2-Chloropyrazine, molecular formula is C4H3ClN2, HPLC of Formula: C4H3ClN2, belongs to Pyrazines compound, is a common compound. In a patnet, author is Chatterjee, Debabrata, once mentioned the new application about 14508-49-7.

Electron Transfer Reactions of Ru-III(edta) Containing the N-Heterocyclic Ligand Pyrazine: Kinetic and Mechanistic Studies

Electron transfer reactions involving Ru(III) complexes pioneered by Nobel Laureate Henry Taube in the ‘late sixties’, has been an area of continued research for more than the past five decades. This review focuses on the research progress in the use of a Ru(III) complex containing the ‘edta’ ligand (edta(4-) = ethylenediaminetetraacetate) in electron transfer processes, and mainly covers the electron transfer reaction of [RuIII(edta)(pz)](-) (pz = pyrazine) with biologically important reductants, viz. L-ascorbic acid, catechol, sulfite, sulfide and thiols, highlighting the authors’ own research work. The scope of this review is to contribute to the mechanistic understanding of electron transfer reactions of [RuIII(edta)(pz)](-) with aforementioned biologically important electron donors, and to illustrate the preferential reaction pathway(s).

I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 14508-49-7 help many people in the next few years. HPLC of Formula: C4H3ClN2.

Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Guchhait, Sankar Kumar, once mentioned the application of 14508-49-7, Name is 2-Chloropyrazine, molecular formula is C4H3ClN2, molecular weight is 114.53, MDL number is MFCD00006124, category is Pyrazines. Now introduce a scientific discovery about this category, Quality Control of 2-Chloropyrazine.

Chan-Lam N-arylation and C-H amination with heteroaromatic ring-NH: an approach to access extended-fused imidazo[1,2-a]-pyridines/pyrazines

A di-amination strategy of areneboronic acids with heterocyclic azines via a tandem process of intermolecular Chan-Lam N-arylation and intramolecular arene C-H amination under copper(ii)-mediated aerobic conditions has been realized. It constructs a fused imidazole scaffold and affords a convenient route to access imidazo[1,2-a]-fused pyridine, pyrazine and other heterocycles.

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Synthetic Route of 14508-49-7, Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. 14508-49-7, Name is 2-Chloropyrazine, SMILES is ClC1=CN=CC=N1, belongs to Pyrazines compound. In a article, author is Loos, Pierre-Francois, introduce new discover of the category.

A Mountaineering Strategy to Excited States: Highly Accurate Energies and Benchmarks for Medium Sized Molecules

Following our previous work focusing on compounds containing up to 3 non-hydrogen atoms [J. Chem. Theory Comput. 2018, 14, 4360-4379], we present here highly accurate vertical transition energies obtained for 27 molecules encompassing 4, 5, and 6 non-hydrogen atoms: acetone, acrolein, benzene, butadiene, cyanoacetylene, cyanoformaldehyde, cyanogen, cyclopentadiene, cyclopropenone, cyclopropenethione, diacetylene, furan, glyoxal, imidazole, isobutene, methylenecyclopropene, propynal, pyrazine, pyridazine, pyridine, pyrimidine, pyrrole, tetrazine, thioacetone, thiophene, thiopropynal, and triazine. To obtain these energies, we use equation-of-motion/linear-response coupled cluster theory up to the highest technically possible excitation order for these systems (CC3, EOM-CCSDT, and EOM-CCSDTQ) and selected configuration interaction (SCI) calculations (with tens of millions of determinants in the reference space), as well as the multiconfigurational n-electron valence state perturbation theory (NEVPT2) method. All these approaches are applied in combination with diffuse-containing atomic basis sets. For all transitions, we report at least CC3/aug-cc-pVQZ vertical excitation energies as well as CC3/aug-cc-pVTZ oscillator strengths for each dipole-allowed transition. We show that CC3 almost systematically delivers transition energies in agreement with higher-level methods with a typical deviation of +/- 0.04 eV, except for transitions with a dominant double excitation character where the error is much larger. The present contribution gathers a large, diverse, and accurate set of more than 200 highly accurate transition energies for states of various natures (valence, Rydberg, singlet, triplet, n -> pi*, pi -> pi*, …). We use this series of theoretical best estimates to benchmark a series of popular methods for excited state calculations: CIS(D), ADC(2), CC2, STEOM-CCSD, EOM-CCSD, CCSDR(3), CCSDT-3, CC3, and NEVPT2. The results of these benchmarks are compared to the available literature data.

Synthetic Route of 14508-49-7, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. I hope my blog about 14508-49-7 is helpful to your research.

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 14508-49-7, Name is 2-Chloropyrazine, molecular formula is C4H3ClN2. In an article, author is Mortzfeld, Frederik B.,once mentioned of 14508-49-7, Product Details of 14508-49-7.

Pyrazines: Synthesis and Industrial Application of these Valuable Flavor and Fragrance Compounds

Alkyl pyrazines-other than being extracted from various natural sources such as coffee beans, cocoa beans, and vegetables-can be synthesized by chemical methods or by certain microorganisms. The importance of pyrazines for the food industry is expected to grow in the upcoming years due to the higher demand for convenience products. The roasty, nutty, and earthy smell is reminiscent of coffee and cocoa, depending on substitution and concentration of pyrazines. The growing awareness of people about the ingredients and the origin of their daily food has strongly influenced the market with labels like organic and natural. Many flavor ingredients prepared by biotechnological methods have conquered the market recently and are destined to replace the ineffective (0.01% pyrazine kg(-1)biomass) extraction from plants or animal sources. This review focuses on the achievements and challenges in pyrazine synthesis. The major part deals with an overview of methods such as the extraction of natural products, the chemical and biocatalytic synthesis, and fermentation by microorganisms. The different types of production are decisive for the declaration and value of the final product and span from 200-3500 US$ kg(-1)for the synthetically produced or the naturally extracted 2,5-dimethylpyrazine, respectively.

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In an article, author is Ojha, Minita, once mentioned the application of 14508-49-7, Name is 2-Chloropyrazine, molecular formula is C4H3ClN2, molecular weight is 114.53, MDL number is MFCD00006124, category is Pyrazines. Now introduce a scientific discovery about this category, Name: 2-Chloropyrazine.

Generation and trapping of non-aromatic cycloimines via diazotization/dediazotization of N-amino cyclic amines: theoretical and experimental results

A theoretical investigation of the model diazotization/dediazotization of N-aminopiperidine and N-aminomorpholine at the DFT (B3LYP/6-31+G(d)) level indicated that the corresponding cycloimines can be generated transiently, which can be trapped with dimethyl acetylenedicarboxylate (DMAD) to form a 1,4-dipole followed by cycloaddition of the latter with a second molecule of DMAD to give the corresponding pyrido-annelated products. All steps have low activation free energy barriers and are thermodynamically favoured. Based on the theoretical results, we carried out successfully diazotization of N-amino cyclic amines, namely N-aminopiperidine, 4-aminomorpholine and 1-amino-4-methylpiperazine withtert.-butyl nitrite followed by dediazotization to generate transiently the corresponding cycloimines, which could be trapped with dimethyl acetylenedicarboxylate. to afford new annelated pyridine derivatives, namely tetramethyl9H-5,6,7,8-tetrahydroquinolizine-1,2,3,4-tetracarboxylate, tetramethyl 5,6,8,9-tetrahydropyrido[2,1-c][1,4]oxazine-1,2,3,4-tetracarboxylate and tetramethyl9H-5,6,7,8-tetrahydro-7-methylpyrido[1,2-a]pyrazine-1,2,3,4-tetracarboxylate which were duly characterized.

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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, Formula: C4H3ClN2, 14508-49-7, Name is 2-Chloropyrazine, SMILES is ClC1=CN=CC=N1, belongs to Pyrazines compound. In a document, author is Li, Lin, introduce the new discover.

Effect of Reaction Conditions on the Volatile Pyrazines Components of Defatted Flaxseed Meal in the Maillard Reaction System

Defatted flaxseed meal, as a high-protein by-product can be used as a good raw material for the Maillard reaction (MR). A MR model system was established using glucose, fructose, and glucose/fructose (1:1) to produce volatile compounds typically obtained from defatted flaxseed meal protein hydrolysate; these compounds were analyzed using head-space solid phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). From the 12 MR model reaction groups, the production of pyrazines was between 12.76% and 26.56%. In the 1G group (the group prepared using DH1= 7.87% with a glucose concentration of 10%), the amount of pyrazines generated reached 26.56%, and this was higher than that of the other 11 model reaction groups. The effect of reaction temperature (100-150 degrees C), reaction time (10-60 min), and sugar concentration (5-30%) on pyrazine content was determined using the 1G group. The results of this study indicated that the effect of temperature on pyrazine production was higher than that exerted by reaction time and glucose addition. The pyrazine content reached the maximum at a reaction temperature of 140 degrees C. The degree of reaction and pH value were also determined; the results demonstrated that accumulation of pyrazines was suboptimal when the pH of the system was dramatically decreased. For the overall reaction, the pyrazine content remained similar to that of the final products; however, the pyrazine content exhibited little correlation with the intermediate products in the MR.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 14508-49-7. Formula: C4H3ClN2.

Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Moghzi, Faezeh, once mentioned the application of 14508-49-7, Name is 2-Chloropyrazine, molecular formula is C4H3ClN2, molecular weight is 114.53, MDL number is MFCD00006124, category is Pyrazines. Now introduce a scientific discovery about this category, Safety of 2-Chloropyrazine.

0D to 3D Pr-III metal-organic networks crystal engineered for optimal iodine adsorption

Four new praseodymium(III) metal-organic compounds varying in dimensionality from 0D to 3D have been designed and synthesized based on N-heterocyclic polycarboxylic acids, including pyridine-2,6-dicarboxylic acid (H(2)pydc) and pyrazine-2,3-dicarboxylic acid (H(2)pzdc). Altering the concentration of piperazine (pip, ancillary ligand) enables control over the dimensionality of the compound by switching between the 0D [H(2)pip][Hpip][Pr(pydc)(3)]center dot 4H(2)O (I) and the 1D {[Pr(pydc)( Hpydc)(H2O)(2)]center dot 4H(2)O}(n) (II) coordination polymer (CP). Upon replacing H(2)pydc with H2pzdc, CP II is converted to the 2D CP [Pr(pzdc)(Hpzdc)(H2O)(3)](n) (III) and using the metalloligand [Zn(Hpzdc)(2)(H2O)(2)](2-) the 3D heterometallic CP {[Pr2Zn(pzdc)(4)(H2O)(6)]center dot 2H(2)O}(n) (IV) is formed. Compound IV shows high stability in the absence of uncoordinated solvent molecules and is stable up to 400 degrees C, even in the presence of humidity. Therefore, IV was utilized for iodine adsorption in the vapour phase and in the presence of humidity. The results confirm the remarkable potential of IV for reversible adsorption of iodine vapour.

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Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 14508-49-7, Name is 2-Chloropyrazine, molecular formula is , belongs to Pyrazines compound. In a document, author is Wu, Kun, Category: Pyrazines.

Cr2O72- inside Zr/Hf-based metal-organic frameworks: highly sensitive and selective detection and crystallographic evidence

Herein, we report the synthesis of three pairs of isostructural zirconium- and hafnium-based homometallic metal-organic frameworks (MOFs, termed Zr-MOF-1 and Hf-MOF-1, Zr-MOF-2 and Hf-MOF-2, and Zr-MOF-3 and Hf-MOF-3) with respective scu, sqc, and flu topologies by using the aggregation-induced-emission (AIE) ligand H4BTTB (4,4 ‘,4 ”,4 ”’-(pyrazine-2,3,5,6-tetrayl)tetrabenzoic acid). As expected, all of them display excellent luminescence properties, and their potential application in the detection of Cr2O72- has been extensively studied. Among them, Zr/Hf-MOF-2 exhibits the high adsorption capacity for Cr2O72- (153 mg g(-1) and 149 mg g(-1), respectively), while Zr/Hf-MOF-3 demonstrates exceptional sensitivity in the detection of Cr2O72-, and the limits of detection are calculated to be 0.013 mu M and 0.019 mu M, respectively. The values are comparable to those of the best-performing MOF materials reported so far. Significantly, single-crystal X-ray diffraction studies revealed the exact location and configuration of Cr2O72- inside Zr/Hf-MOF-2. To the best of our knowledge, this is the first example of Zr/Hf-MOFs with direct evidence showing that Cr2O72- is linked to the Zr/Hf oxide cluster by replacing its terminal H2O/OH- groups within the single crystal.

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Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. , Product Details of 14508-49-7, 14508-49-7, Name is 2-Chloropyrazine, molecular formula is C4H3ClN2, belongs to Pyrazines compound. In a document, author is Parisi, Emmanuele, introduce the new discover.

Tautomeric and conformational switching in a new versatile N-rich heterocyclic ligand

A new N-rich triazolo-triazole derivative, 4-methyl-7-(pyrazin-2-yl)-2H-[1,2,4]triazolo[3,2-c][1,2,4]triazole (C8H7N7), bearing a pyrazine residue at 7-position of the triazolo-triazole bicycle, was synthesized, and its acid-base and metal coordination properties were evaluated in solution. The results showed amphoteric behavior and the formation of stable complexes with Cu(II) and Zn(II) in pH intervals in which the ligand is neutral or deprotonated. Computational studies were performed in order to evaluate the stability of the different tautomers/conformers of the ligand, and the proton position in the neutral and acidic forms. Single crystal X-ray analysis of the free neutral ligand (2H/s-trans tautomer/conformer), and of its singly protonated (2H-3H/s-trans), doubly protonated (2H-3H-7H/s-trans) and deprotonated forms showed that the influence of the pyrazine ring on the triazolo-triazole system is mainly as electron withdrawing and chelating group, and proton acceptor. Different coordination modes have been evidenced for the neutral and deprotonated ligand. Upon metal coordination, the neutral ligand switches from 2H/strans to 3H/s-cis tautomer/conformer forming five-membered chelate rings, while the anionic deprotonated ligand forms six-membered chelate rings in the s-trans conformation. Altogether, five different tautomers/conformers of the ligand were isolated and characterized. In vitro tests confirmed the general antiproliferative activity of triazolo-triazole compounds and the importance of substitution in position 7 for their selectivity.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 14508-49-7. Product Details of 14508-49-7.

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Category: Pyrazines, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 14508-49-7, Name is 2-Chloropyrazine, molecular formula is C4H3ClN2. In an article, author is Luo, Lan,once mentioned of 14508-49-7.

Rare example of chiral and achiral polymorphs of a metal-oxide/organic hybrid compound

Hydrothermal techniques have been used to prepare two new Cu(I)/Mo(VI)-oxide hybrids that represent a rare example of crystallization of both achiral (1) and chiral (2) polymorphic structures with the composition CuMoO3 (p2c) (p2c = pyrazine-2-carboxylate). Their structures were characterized by single-crystal X-ray diffraction (1 – space group: P2(1)/c, Z = 4; a = 8.4965(3) angstrom, b = 12.7471(5) angstrom, c = 7.2850(3) angstrom), beta= 97.147(2)degrees , and 2 – P3(2), Z = 3, a = 7.6789(2) angstrom, c = 10.9164(5) angstrom) and found to consist of highly-distorted MoO5N octahedra that are vertex-bridged to form -O-Mo-O-Mo-O- chains and connected to each other via the coordinating p2c ligands and Cu(I) cations. In the achiral structure of 1, the p2c ligands and Cu(I) cations are coordinated to a single side of the extended -O-Mo-O-Mo-O- chains. In the chiral structure of 2, by contrast, these coordinate via a helical-type arrangement down the 3(2) screw axis with a rotation of 120 degrees between neighboring octahedra. The chiral polymorph is favored with higher pressure and exhibits a correspondingly higher density owing to the greater packing efficiency of the helical chains, with calculated densities (g cm(-3)) of 2.81 and 2.95 for 1 and 2, respectively. Both are found to have nearly identical band gaps of similar to 1.37 eV, which are significantly smaller than in other related Cu/Mo oxides . Density functional theory calculations show that 1 exhibits a slightly lower energy of similar to 89 meV per formula (or similar to 8.6 kJ mol(-1)) as compared to 2 and is thus energetically favored. Given the higher calculated energy of the chiral polymorph, 2, this suggests that the application of higher pressures can provide a convenient driving force for the crystallization of higher-density, helical-chain structures that are noncentrosymmetric.

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