Tag: M.W=100-200

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 33332-25-1, Name is Methyl 5-chloropyrazine-2-carboxylate, SMILES is ClC1=CN=C(C=N1)C(=O)OC, in an article , author is Al-Turk, Anhar, once mentioned of 33332-25-1, Recommanded Product: Methyl 5-chloropyrazine-2-carboxylate.

Isolation and Molecular Characterization of Antibiotic Producing Bacillus licheniformis Strains Isolated from Soil

Currently, there is an increase prevalence of antibiotic-resistant bacteria worldwide. Therefore, the need for characterization of naturally occuring antibiotics with less antibiotic resistance is required. Soil resources contains valuable antibiotic producing microorganisms that increasingly being utilized for the production of suitable antibiotics. Therefore, this study aimed at identifying an antibiotic bacteria with ability of producing antibiotic that is isolated from soil samples collected from Al Zarqa provenance, an arid area in Jordan. Morphological and biochemical characterization of the isolates were carried out and found that all of the isolates belong to Bacillus genus. Further confirmation of the characterization of the bacteria was done by ribosomal RNA and PCR. The results reveal that the isolates represent Basilluslicheniformis. These bacilli were further investigated for antimicrobial activities against 6 ATCC human pathogens viz., S. aureus, S. pneumonia, Salmonella typhi., E. coli, P. mirabels and E. cloacae. Additionally, the results of Gas Chromatography Mass Spectrometry (GCMS) of ethyl acetate extracts for B. licheniformis secondary metabolites showed that they contain two main antimicrobial compounds namely Pyrrolo [1, 2-a] pyrazine-1, 4-dione,hexahydro and Trans-13-octadecenoic acid. The present work maybe suggests that soil isolates from the studied arid area include antibiotic producing strains that can be utilized commercially.

Interested yet? Read on for other articles about 33332-25-1, you can contact me at any time and look forward to more communication. Recommanded Product: Methyl 5-chloropyrazine-2-carboxylate.

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. 2847-30-5, Name is 2-Methoxy-3-methylpyrazine, molecular formula is C6H8N2O. In an article, author is Yu, You-Jun,once mentioned of 2847-30-5, SDS of cas: 2847-30-5.

Near-Infrared Electroluminescence beyond 800 nm with High Efficiency and Radiance from Anthracene Cored Emitters

Derivatives based on anthryleno[1,2-b]pyrazine-2,3-dicarbonitrile (DCPA) are used as luminescent materials, to realize near-infrared (NIR) electroluminescence. By functionalizing DCPA with aromatic amine donors, two emitters named DCPA-TPA and DCPA-BBPA are designed and synthesized. Both molecules have large dipole moments owing to the strong intramolecular charge transfer interactions between the amine donors and the DCPA acceptor. Thus, compared with doped films, the emission of neat films of DCPA-TPA and DCPA-BBPA can fully fall into the NIR region (>700 nm) with increasing surrounding polarity by increasing doping ratio. Moreover, the non-doped devices based on DCPA-TPA and DCPA-BBPA provide NIR emission with peaks at 838 and 916 nm, respectively. A maximum radiance of 20707 mW Sr-1 m(-2) was realized for the further optimized device based on DCPA-TPA. This work provides a simple and efficient strategy of molecular design for developing NIR emitting materials.

But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 2847-30-5, you can contact me at any time and look forward to more communication. SDS of cas: 2847-30-5.

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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Electric Literature of 22047-25-2, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 22047-25-2, Name is Acetylpyrazine, SMILES is C1=C(N=CC=N1)C(=O)C, belongs to Pyrazines compound. In a article, author is Lee, J., introduce new discover of the category.

Quantitative determination of volatile compounds using TD-GC-MS and isotope standard addition for application to the heat treatment of food

For many foods that undergo thermal treatment, the generation of numerous process-induced compounds has strong implications for food quality and safety. Today, increasing attention is payed to the generation and occurrence of particular classes of newly formed compounds in processed foods for their potential health implication. It is therefore of the utmost importance to monitor the process with fit-for-purpose methods that are appropriate for use in quality control or in research and innovation. Since many quality-related compounds are volatile, there is a need for robust methods that can quantify a broad range of volatile markers and are applicable to on-line monitoring. To meet this need, an original and reliable method based on thermal desorption has been developed for the quantification of volatile compounds sampled on-line by sorbent tubes. For the first time, this method combines in-tube calibration and deuterated standard addition. Ten volatile compounds that are likely to form during heat processing of food (i.e. baking of cereal products), were chosen as target analytes for their relevance to food quality and their different physicochemical properties: 3-methylbutanal, pyrazine, 2-methylpyrazine, 2,5-dimethylpyrazine, 2,6-dimethylpyrazine, acetic acid, furfural, 5-methylfurfural, furfuryl alcohol and 5-hydroxymethylfurfural. The key steps in the analytical procedure were optimized and carefully characterized in terms of recovery, repeatability and reliability. The TD-GC-MS method displayed good linearity over extended ranges for all compounds (R-2: 0.9950 to 0.8880) with low limits of quantification (LOQs) ranging from 0.0141 to 11.5 ng. The matrix effect was negligible for most compounds, except for 5-hydroxymethylfurfural (21.5%), the most polar and least volatile compound. The method was applied to determining process-induced compounds generated during the baking of a model cake and sampled from baking vapors at three different times during the heat treatment. Of all the compounds extracted, the target analytes exhibited concentrations spread over very broad ranges. This highly sensitive method could therefore be used for the early quantification of relevant markers during the processing of food matrices, for quality or mitigation purposes. Quantitative TD-GC-MS with in-tube calibration and isotope standard addition is particularly well-suited for applications where an accurate determination is required of both trace level and major volatile compounds over time. This method may therefore be relevant for monitoring either industrial or domestic food processes (e.g. baking, frying, roasting), for multi-residue analyses linked to quality and safety, or reaction kinetics for multi-response modeling. It can also be transferable to emerging non-food applications.

Electric Literature of 22047-25-2, Each elementary reaction can be described in terms of its molecularity, the number of molecules that collide in that step. The slowest step in a reaction mechanism is the rate-determining step.you can also check out more blogs about 22047-25-2.

Reference of 33332-25-1, Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. 33332-25-1, Name is Methyl 5-chloropyrazine-2-carboxylate, SMILES is ClC1=CN=C(C=N1)C(=O)OC, belongs to Pyrazines compound. In a article, author is Shivanna, Mohana, introduce new discover of the category.

Control of local flexibility towardsp-xylene sieving in Hofmann-type porous coordination polymers

Adsorption-based xylene isomer separation is more energy efficient than conventional processes. Herein, three isostructural Hofmann-type porous coordination polymers (PCPs), {M(Pz)[Ni(CN)(4)](n)} (M = Fe, FePzNi, Co, CoPzNi, and Ni, NiPzNi; Pz = pyrazine) were synthesized and shown to exhibit coordination-dependent lability for the selectivity towardp-xylene overm- ando-xylene.

Reference of 33332-25-1, Because enzymes can increase reaction rates by enormous factors and tend to be very specific, typically producing only a single product in quantitative yield, they are the focus of active research.you can also check out more blogs about 33332-25-1.

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, Computed Properties of C5H4N2O3, 20737-42-2, Name is 3-Oxo-3,4-dihydropyrazine-2-carboxylic acid, SMILES is O=C(C1=NC=CNC1=O)O, belongs to Pyrazines compound. In a document, author is Kirkman-Davis, Emma, introduce the new discover.

Pyrazine-bridged Cu(II) chains: diaquabis(n-methyl-2-pyridone)copper(II) perchlorate complexes

A family of pyrazine-bridged, linear chain complexes of Cu(II) of the formula [CuL2(H2O)(2)(pz)](ClO4)(2) [pz = pyrazine; L = n-methyl-2(1H)-pyridone, n = 3 (1), 5 (2), and 6 (3)] has been prepared. Single-crystal X-ray diffraction shows six-coordinate, pyrazine-bridged chains with trans-pairs of ancillary ligands. The substituted pyridine molecules exist in their pyridone tautomers and are coordinated through the carbonyl oxygen atom. The structure is stabilized by intramolecular hydrogen bonds between the pyridone and water molecule, and via hydrogen bonds between the water molecules and perchlorate ions. 2 undergoes a crystallographic phase transition between C2/c (high temperature phase) and P (1) over bar (low temperature phase). Powder EPR spectra reveal that all complexes are rhombic, although differences between g(x) and g(y) can only be seen clearly at Q-band. Variable temperature magnetic susceptibility data show antiferromagnetic interactions and the data were fit to the uniform chain model yielding J/k(B) = -9.8, -9.2 and -11 K for 1-3 respectively. Attempts to model an interchain interaction strength indicate that the chains are very well isolated.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 20737-42-2 is helpful to your research. Computed Properties of C5H4N2O3.

Some common heterocyclic compound, 32111-28-7, name is N-Methylpyrazin-2-amine, molecular formula is C5H7N3, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route. Recommanded Product: 32111-28-7

To a stirred solution of N-methylpyrazin-2-amine (1 g, 9.2 mmol) in dimethyl sulfoxide (20 ml) / water (0.4 ml) at 10 C was added portionwise N-lodosuccinimide (4.1 g, 18.4 mmol). The reaction mixture was then allowed to warm slowly to room temperature and stirred at that temperature overnight. An additonal aliquot of N-lodosuccinimide (4.1 g,18.4 mmol) was then added at room temperature. After stirring for 7hr, the reaction mixture was poured onto ice (20 g). The precipitate was collected, washed with cold water (20 ml), and dried to provide the title compound (2.15 g, 65 %). 1H NMR (300MHz, DMSO-d6) 5(ppm): 8.14(s, 1 H), 6.69 (br, 1 H), 2.77(d, 3 H, J=4.5 Hz); ESI-MS(-):360.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 32111-28-7, its application will become more common.

Reference:
Patent; SYNGENTA PARTICIPATIONS AG; EDMUNDS, Andrew; MUEHLEBACH, Michel; STOLLER, Andre; LOISELEUR, Olivier; BUCHHOLZ, Anke; HUETER, Ottmar Franz; BIGOT, Aurelien; HALL, Roger Graham; EMERY, Daniel; JUNG, Pierre Joseph Marcel; LU, Long; WU, Yaming; CHEN, Ruifang; WO2015/715; (2015); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Application of 912773-21-8, In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 912773-21-8 as follows.

A mixture of 2-bromo-5-chloro-pyrazine (1 g, 5.17 mmol), 3-fluoro-5-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)-2-[(lS)-2,2,2-trifluoro-l- methyl -ethoxy ] pyridine (1.73 g, 5.17 mmol), CS2CO3 (3.37 g, 10.34 mmol) and Pd(dppf)Cl2 (567.41 mg, 0.78 mmol) in l,4-Dioxane (100 mL) and Water (10 mL) was stirred at 55 C under N2 for 5 hours. From LCMS, desired MS was observed and no starting material was remained. The solution was cooled to room temperature and concentrated to give a residue. To the residue was added water (50 mL), extracted with EtOAc (50 mL x 2). The combined organic phase was washed with water (50 mL), brine (50 mL x 2), dried over anhydrous Na2S04, filtered and concentrated to give the crude product. The crude product was purified by flash chromatography column on silica gel (EtOAc in PE = 0% to 5%) to give the product (1.4 g,4.35 mmol, 84% yield) as a solid. ‘H NMR (DMSO-c, 400MHz) 5H= 9.18 (s, 1H), 8.91 – 8.74 (m, 2H), 8.46 (dd, 1H), 6.05 – 5.99 (m, 1H), 1.53 (d, 3H).

According to the analysis of related databases, 912773-21-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; PRAXIS PRECISION MEDICINES, INC.; GRIFFIN, Andrew, Mark; MARRON, Brian, Edward; MARTINEZ BOTELLA, Gabriel; REDDY, Kiran; WITTMANN, Marion; (0 pag.)WO2019/232209; (2019); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 4774-14-5, name is 2,6-Dichloropyrazine, A new synthetic method of this compound is introduced below., Recommanded Product: 2,6-Dichloropyrazine

EXAMPLE 5 2-amino-6-chloropyrazine 120 ml of water, 20.8 ml (0.31 mol, 4.6 eq) of an aqueous 28% ammonia solution and 10 g (0.067 mol, 1 eq) of 2,6-dichloropyrazine were successively added to an autoclave reactor. The autoclave was sealed and the mixture heated at 140 C. for 3 h, then left at room temperature for 60 h. The mixture was filtered, the precipitate washed with water, then vacuum dried. The reaction produced 5.4 g of a fine powder (yield: 63%). 1H NMR (CDCl3) delta (ppm): 7.88 (s, 1H, CH); 7.84 (s, 1H, CH); 4.68 (m, 2H, NH2). HPLC: t=1.07 min MS: 130 (MH+) HPLC purity: 100%

The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.

Reference:
Patent; Maillet, Magali; Saniere, Laurent; Nicolai, Eric; Potin, Dominique; Langlois, Michel; US2005/267126; (2005); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

These common heterocyclic compound, 109838-85-9, name is (R)-2-Isopropyl-3,6-dimethoxy-2,5-dihydropyrazine, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route. category: Pyrazines

To a dry-ice / acetone cooled solution of scheme 5-8 compound S5 (5 g, 0.027 mol) in THF (50 ml), n-BuLi (2.5 M, 14.1 mL, 0.035 mol) was added dropwise for 30 min. After addition, the reaction was stirred at this temperature for 30 min, followed by dropwise addition of a solution of compound S4 (13.6 g, 0.04 mol) in THF (20 mL). The reaction mixture was stirred at this temperature for another 30 min and allowed to stir at room temperature for 16 h. Then the reaction was quenched with aqeuous NH4Cl (50 mL) and extracted with ethyl acetate (60 mL x 2). The combined organic layers were washed with brine, dried over anhydrous Na2SO4, filtered and then concentrated. The residue was purified by column chromatography on silica gel (eluted with petroleum ether: ethyl acetate =10:1) to afford the title compound (6 g, yield 50.4%) and scheme 5-8 compound S4 (4.8 g) was recovered.

The synthetic route of (R)-2-Isopropyl-3,6-dimethoxy-2,5-dihydropyrazine has been constantly updated, and we look forward to future research findings.

Reference:
Patent; ACHILLION PHARMACEUTICALS, INC.; WILES, Jason, Allan; PHADKE, Avinash, S.; DESHPANDE, Milind; AGARWAL, Atul; CHEN, Dawei; GADHACHANDA, Venkat, Rao; HASHIMOTO, Akihiro; PAIS, Godwin; WANG, Qiuping; WANG, Xiangzhu; GREENLEE, William; (508 pag.)WO2017/35409; (2017); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem