Category: Pyrazines

Name: Pyrazine-2-carboxylic acid. In 2020 J COORD CHEM published article about COMPLEXES; AZIDO; MN in [Yang, Zongfei; Yang, Xindi; Jin, Linyu; Dong, Kaili; Ma, Pengtao; Niu, Jingyang; Wang, Jingping] Henan Univ, Henan Key Lab Polyoxometalate Chem, Inst Mol & Crystal Engn, Coll Chem & Chem Engn, Kaifeng 475004, Henan, Peoples R China in 2020, Cited 29. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

A high-nuclearity nickel-substituted polyoxotungstate, Na6K5.5H4.5{[Ni-8(OH)(6)(H2O)(2)](CO3)(3)(SiW9O34)(2)}center dot 22H(2)O (1), has been obtained by the reaction of Na-10[alpha-SiW9O34]center dot 18H(2)O, Ni(NO3)(2)center dot 6H(2)O and K(2)CO(3)in aqueous solution and characterized by IR spectroscopy, single crystal X-ray diffraction, thermal gravimetric analysis and elemental analysis. Carbonate is not only used to adjust the pH of the solution, but also is a structure-stabilizing agent. The polyoxoanion {[Ni-8(OH)(6)(H2O)(2)](CO3)(3)(SiW9O34)(2)}(16-)(1a) can be regarded as two {[Ni-4(OH)(3)(H2O)](SiW9O34)} subunits connected by three carbonate groups, which represents the first polyanion containing an octanuclear nickel cluster based on trivacant Keggin-type polyoxotungstate {XW9} (X = heteroatom). The subunit {[Ni-4(OH)(3)(H2O)](SiW9O34)} can be viewed as a tetranuclear nickel cluster linked to a trivacant Keggin-type polyoxotungstate {SiW9O34}. Furthermore, magnetic measurements show that1exhibits antiferromagnetic interactions.

Name: Pyrazine-2-carboxylic acid. Welcome to talk about 98-97-5, If you have any questions, you can contact Yang, ZF; Yang, XD; Jin, LY; Dong, KL; Ma, PT; Niu, JY; Wang, JP or send Email.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

In 2020 WASTE BIOMASS VALORI published article about TRANSFER HYDROGENATION; LEVULINIC ACID; ELECTROCATALYTIC HYDROGENATION; REDUCTIVE ETHERIFICATION; FURFURYL ALCOHOL; CONVERSION; TRANSFORMATION; HMF; 2,5-BIS(HYDROXYMETHYL)FURAN; DERIVATIVES in [Hu, Lei; Liu, Su; Song, Jie; Jiang, Yetao; He, Aiyong; Xu, Jiaxing] Huaiyin Normal Univ, Jiangsu Collaborat Innovat Ctr Reg Modern Agr & E, Sch Chem & Chem Engn, Jiangsu Key Lab Biomass Based Energy & Enzyme Tec, Huaian 223300, Peoples R China in 2020, Cited 82. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5. Name: Pyrazine-2-carboxylic acid

By the simple assembly of zirconium tetrachloride and diethylenetriaminepentaacetic acid (DTPA), a new acid-base bifunctional zirconium-containing organic-inorganic nanohybrid catalyst (Zr-DTPA) was successfully prepared in this work, and then used for the catalytic transfer hydrogenation (CTH) of biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-dihydroxymethylfuran (DHMF) using isopropanol as the in situ hydrogen donor and reaction solvent. Satisfactorily, 98.7% HMF conversion and 95.2% DHMF yield could be achieved in 4 h at a moderate reaction temperature of 140 degrees C. After systematic studies, this excellent catalytic activity was proved to be mainly ascribed to the synergistic effect of Lewis-acidic sites (Zr4+) and Lewis-basic sites (O2- and N) with higher strengths and contents. Meanwhile, Zr-DTPA could be readily separated by filtration, when it was repeatedly used 5 recycles, its catalytic activity was not obviously changed, demonstrating that Zr-DTPA had good heterogeneity and reusability. More importantly, Zr-DTPA could also be employed to effectively catalyze the CTH of 5-methylfurfural, furfural, levulinic acid, ethyl levulinate and cyclohexanone into the corresponding products with high yields, indicating that it showed a superior universality for the selective hydrogenation of various biomass-derived carbonyl compounds.Graphical Abstract

Name: Pyrazine-2-carboxylic acid. Welcome to talk about 98-97-5, If you have any questions, you can contact Hu, L; Liu, S; Song, J; Jiang, YT; He, AY; Xu, JX or send Email.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Recently I am researching about MONOCARBOXYLATE-N-OXIDES; LIQUID-LIQUID-EXTRACTION; 2-PYRAZINECARBOXYLIC ACID; THEORETICAL INSIGHTS; LUMINESCENCE; SEPARATION; EUROPIUM(III); EU3+; LANTHANIDES; SELECTIVITY, Saw an article supported by the . Published in AMER CHEMICAL SOC in WASHINGTON ,Authors: Dumpala, RMR; Boda, A; Kumar, P; Rawat, N; Ali, SM. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid. Application In Synthesis of Pyrazine-2-carboxylic acid

The denticity, flexibility, and steric hindrance of the ligand are key factors in deciding the mode and number of coordination around a metal ion on complex formation. The thermodynamic aspects of lanthanide complexation with various multidentate ligands provides a significant insight into understand the coordination chemistry of lanthanides in framing the relevant metal organic networks for the applications in biological, biochemical and medical aspects. The pyrazine carboxylic acids are known to form many structurally important complexes and further can form chelates with coordination number of eight for europium in which more water molecules can be knocked out from the primary coordination sphere than demanded by denticity of the ligand. The present studies aimed at ESI-MS characterization and determination of the thermodynamic parameters (log beta, Delta G, Delta H, and Delta S), luminescence properties of europium complexes with pyrazine-2-carboxylate and pyrazine-2,3-dicarboxylate in aqueous solutions by experiment as well as theory. Time resolved luminescence spectroscopy supported by DFT calculations are carried out to optimize the stable geometries of the complexes with various modes of binding and coordination. Furthermore, the thermodynamic parameters estimated theoretically have been used to trace the path of complex formation.

Welcome to talk about 98-97-5, If you have any questions, you can contact Dumpala, RMR; Boda, A; Kumar, P; Rawat, N; Ali, SM or send Email.. Application In Synthesis of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Computed Properties of C5H4N2O2. I found the field of Chemistry very interesting. Saw the article Cobalt-Catalyzed Direct Carbonylative Synthesis of Free (NH)-Benzo[cd]indol-2(1H)-ones from Naphthylamides published in 2019, Reprint Addresses Wu, XF (corresponding author), Zhejiang Sci Tech Univ, Dept Chem, Xiasha Campus, Hangzhou 310018, Peoples R China.; Wu, XF (corresponding author), Univ Rostock, Leibniz Inst Katalyse eV, Albert Einstein Str 29a, D-18059 Rostock, Germany.. The CAS is 98-97-5. Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid.

A cobalt-catalyzed C-H carbonylation of naphthylamides for the synthesis of benzo[cd]indol-2(1H)-one scaffolds has been developed. The reaction employs a traceless directing group and uses benzene-1,3,5-triyltriormate as the CO source, affording various free (NH)-benzo[cd]indol-2(1H)-ones in moderate to high yields (up to 88%). Using this protocol, the total synthesis of BET bromodomain inhibitors A and B was accomplished as well.

Computed Properties of C5H4N2O2. Welcome to talk about 98-97-5, If you have any questions, you can contact Ying, J; Fu, LY; Zhong, GQ; Wu, XF or send Email.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Safety of Pyrazine-2-carboxylic acid. In 2020 CRYST GROWTH DES published article about HALIDE ION SYNTHON; CRYSTAL-STRUCTURES; INTERMOLECULAR INTERACTIONS; HYDROGEN-BONDS; MOLECULES; HIERARCHY; CROSSOVER; LIGANDS; METALS; BR in [Khavasi, Hamid Reza; Gholami, Akram; Hosseini, Mahdieh; Nikpoor, Leyla] Shahid Beheshti Univ, Dept Inorgan Chem & Catalysis, Tehran 1983963113, Iran; [Eskandari, Kiamars] Isfahan Univ Technol, Dept Chem, Esfahan 8415683111, Iran in 2020, Cited 45. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

A family of 10 compounds, each containing a MX2-pyrazine carboxylate complex anion and a protonated halo- (X’-) amino pyridine cation (MX2 = ZnCl2, ZnBr2, ZnI2, HgBr2, and HgI2; X’ = Cl, Br, I), are presented; a suitable system for pursuing C-X’center dot center dot center dot X-M halogen bonding (XB). The influence of halogen manipulation, metal ion and coordination variation on the nature and strength of C-X’center dot center dot center dot X-M interactions was discussed in terms of geometrical parameters, binding energies and charge density analysis with emphasis on the Laplacian of the electron density, del(2)rho. Interplay of XBs with other noncovalent interactions, mainly N-H center dot center dot center dot XM and N-py-H+center dot center dot center dot O- bonds, in supramolecular assemblies, were also investigated. The C-X’center dot center dot center dot X-M and N-H center dot center dot center dot X-M bonds have rationally been modified in strength upon changing the halogens involved, leading to systematic variations in the crystal packing.

Welcome to talk about 98-97-5, If you have any questions, you can contact Khavasi, HR; Gholami, A; Hosseini, M; Nikpoor, L; Eskandari, K or send Email.. Safety of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Recommanded Product: Pyrazine-2-carboxylic acid. Kojima, K; Yakushiji, F; Katsuyama, A; Ichikawa, S in [Ichikawa, Satoshi] Hokkaido Univ, Global Inst Collaborat Res & Educ GI CoRE, Fac Pharmaceut Sci, Ctr Res & Educ Drug Discovery, Sapporo, Hokkaido 0600812, Japan; [Ichikawa, Satoshi] Hokkaido Univ, Global Inst Collaborat Res & Educ GI CoRE, Global Stn Biostofaces & Drug Discovery, Sapporo, Hokkaido 0600812, Japan; [Kojima, Keita; Yakushiji, Fumika; Katsuyama, Akira] Hokkaido Univ, Fac Pharmaceut Sci, Sapporo, Hokkaido 0600812, Japan; [Yakushiji, Fumika; Katsuyama, Akira] Hokkaido Univ, Fac Pharmaceut Sci, Ctr Res & Educ Drug Discovery, Sapporo, Hokkaido 0600812, Japan published Total Synthesis of Echinomycin and Its Analogues in 2020, Cited 32. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

The first total synthesis of echinomycin (1) was accomplished by featuring the late-stage construction of the thioacetal moiety via Pummerer rearrangement and simultaneous cyclization, as well as two-directional elongation of the peptide chains to construct a C2-symmetrical bicyclic octadecadepsipeptide bridged with a sulfide linkage. This strategy can be applicable to a variety of echinomycin analogues.

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Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

An article Orientation-dependent conformational polymorphs in two similar pyridine/pyrazine phenolic esters WOS:000471797000008 published article about HYDROGEN-BOND; CRYSTAL-STRUCTURES; MODEL ENERGIES; SOLID FORMS; PHASE; SALTS; COCRYSTALS; DRUG; ACCURATE; ACID in [Samie, Ali; Salimi, Alireza] Ferdowsi Univ Mashhad, Fac Sci, Dept Chem, Mashhad, Razavi Khorasan, Iran in 2019, Cited 67. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5. Quality Control of Pyrazine-2-carboxylic acid

On the basis of crystal engineering, two similar esters of phenyl pyridine-2-carboxylate (I) and phenyl pyrazine-2-carboxylate (II) were designed and synthesized. The compounds were characterized using FT-IR, mass spectrometry, CHN-elemental analyses, NMR and PXRD. For each compound, two polymorphs were obtained (Ia, Ib and IIa, IIb) and identified by TGA, DSC and SCXRD. A comparison of the crystal structures of the polymorphs revealed that the different torsion angles of the pyrazine (tau(1)) and phenyl (tau(2)) rings to the ester backbone resulted in the conformers I and II, respectively. Theoretical criteria (max(Delta theta), rmsd[r]-crystal, energy profile) confirmed that the structural differences in the conformers are in the range of acceptable values for the detection of conformational changes. The phase stability of the polymorphs was investigated by slurry and grinding methods as well as by the HSM technique. Since the orientations of pyrazine and phenyl moieties were altered in the polymorphs, the hydrogen bond donor and acceptors exhibited meaningful supramolecular architectures in the crystal packing as well as C-HMIDLINE HORIZONTAL ELLIPSISN, C-HMIDLINE HORIZONTAL ELLIPSISO and C-HMIDLINE HORIZONTAL ELLIPSIS pi interactions. The energetic study of the noncovalent interactions in the molecular pairs (dimers) of the polymorph crystal structures was performed by DFT-D calculations.

Welcome to talk about 98-97-5, If you have any questions, you can contact Samie, A; Salimi, A or send Email.. Quality Control of Pyrazine-2-carboxylic acid

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Wang, JW; Hong, G; Li, GL; Wang, WZ; Liu, TJ in [Wang, Jiawen; Liu, Tianjun] Tianjin Univ Tradit Chinese Med, Grad Inst, Tianjin 301617, Peoples R China; [Hong, Ge; Li, Guoliang; Wang, Wenzhi; Liu, Tianjun] Chinese Acad Med Sci & Peking Union Med Coll, Inst Biomed Engn, Tianjin Key Lab Biomed Mat, Tianjin 300192, Peoples R China; [Hong, Ge; Liu, Tianjun] Chinese Acad Med Sci & Peking Union Med Coll, Inst Mat Med, State Key Lab Bioact Subst & Funct Nat Med, Beijing 100050, Peoples R China published Novel Homo-Bivalent and Polyvalent Compounds Based on Ligustrazine and Heterocyclic Ring as Anticancer Agents in 2019, Cited 30. Computed Properties of C5H4N2O2. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

Bivalent and polyvalent inhibitors can be used as antitumor agents. In this experiment, eight ligustrazine dimers and seven ligustrazine tetramers linked by alkane diamine with different lengths of carbon chain lengths were synthesized. After screening their antiproliferation activities against five cancer cell lines, most ligustrazine derivatives showed better cytotoxicity than the ligustrazine monomer. In particular, ligustrazine dimer 8e linked with decane-1,10-diamine exhibited the highest cytotoxicity in FaDu cells with an IC50 (50% inhibiting concentration) value of 1.36 nM. Further mechanism studies suggested that 8e could induce apoptosis of FaDu cells through the depolarization of mitochondrial membrane potential and S-phase cell cycle arrest. Inspired by these results, twenty-seven additional small molecule heterocyclic dimers linked with decane-1,10-diamine and nine cinnamic acid dimers bearing ether chain were synthesized and screened. Most monocyclic and bicyclic aromatic systems showed highly selective anti-proliferation activity to FaDu cells and low toxicity to normal MCF 10A cells. The structure-activity relationship revealed that the two terminal amide bonds and the alkyl linker with a chain length of 8-12 carbon were two important factors to maintain its antitumor activity. In addition, the ADMET calculation predicted that most of the potent compounds had good oral bioavailability.

Computed Properties of C5H4N2O2. Bye, fridends, I hope you can learn more about C5H4N2O2, If you have any questions, you can browse other blog as well. See you lster.

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Carvalho, EM; Paulo, TD; Saquet, AS; Abbadi, BL; Macchi, FS; Bizarro, CV; Campos, RD; Ferreira, TLA; do Nascimento, NRF; Lopes, LGF; Chauvin, R; Sousa, EHS; Bernardes-Genisson, V in [Carvalho, Edinilton Muniz; Paulo, Tercio de Freitas; Saquet, Alix Sournia; Chauvin, Remi; Bernardes-Genisson, Vania] CNRS, Lab Chim Coordinat, LCC, UPR 8241, 205 Route Narbonne,BP 44099, F-31077 Toulouse 4, France; [Carvalho, Edinilton Muniz; Paulo, Tercio de Freitas; Chauvin, Remi; Bernardes-Genisson, Vania] Univ Toulouse, Univ Paul Sabatier, UPS, 118 Route Narbonne, F-31062 Toulouse 9, France; [Carvalho, Edinilton Muniz; Paulo, Tercio de Freitas; Franca Lopes, Luiz Gonzaga; Silva Sousa, Eduardo Henrique] Univ Fed Ceara, Dept Quim Organ & Inorgan, Grp Bioinorgen, Campus Pici, BR-60455760 Fortaleza, Ceara, Brazil; [Abbadi, Bruno Lopes; Macchi, Fernanda Souza; Bizarro, Cristiano Valim] Pontificia Univ Catolica Rio Grande Do Sul PUCRS, Ctr Pesquisas Biol Mol & Func CPBMF, Porto Alegre, RS, Brazil; [Abbadi, Bruno Lopes; Macchi, Fernanda Souza; Bizarro, Cristiano Valim; Franca Lopes, Luiz Gonzaga; Silva Sousa, Eduardo Henrique] Inst Nacl Ciencia & Tecnol TB INCT TB, Porto Alegre, RS, Brazil; [Campos, Rafael de Morais; Abrantes Ferreira, Talles Luann; Falcao do Nascimento, Nilberto Robson] Univ Estadual Ceara, Lab Farmacol Cardiovasc & Renal, Campus Itaperi, BR-60714903 Fortaleza, Ceara, Brazil published Pentacyanoferrate(II) complex of pyridine-4-and pyrazine-2-hydroxamic acid as source of HNO: investigation of anti-tubercular and vasodilation activities in 2020, Cited 40. HPLC of Formula: C5H4N2O2. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5.

A pharmacophore design approach, based on the coordination chemistry of an intimate molecular hybrid of active metabolites of pro-drugs, known to release active species upon enzymatic oxidative activation, is devised. This is exemplified by combining two anti-mycobacterial drugs: pyrazinamide (first line) and delamanid (third line) whose active metabolites are pyrazinoic acid (PyzCOOH) and likely nitroxyl (HNO (or NO.)), respectively. Aiming to generate those active species, a hybrid compound was envisaged by coordination of pyrazine-2-hydroxamic acid (PyzCONHOH) with a Na-3[Fe-II(CN)(5)] moiety. The corresponding pentacyanoferrate(II) complex Na-4[Fe-II(CN)(5)(PyzCONHO(-))] was synthesized and characterized by several spectroscopic techniques, cyclic voltammetry, and DFT calculations. Chemical oxidation of this complex with H(2)O(2)was shown to induce the release of the metabolite PyzCOOH, without the need of theMycobacterium tuberculosis(Mtb) pyrazinamidase enzyme (PncA). Control experiments show that both H2O2- and N-coordinated pyrazine Fe(II)species are required, ruling out a direct hydrolysis of the hydroxamic acid or an alternative oxidative route through chelation of a metal center by a hydroxamic group. The release of HNO was observed using EPR spectroscopy in the presence of a spin trapping agent. The devised iron metal complex of pyrazine-2-hydroxamic acid was found inactive against an actively growing/non-resistantMtbstrain; however, it showed a strong dose-dependent and reversible vasodilatory activity with mostly lesser toxic effects than the reference drug sodium nitroprussiate, unveiling thus a potential indication for acute or chronic cardiovascular pathology. This is a priori a further indirect evidence of HNO release from this metal complex, standing as a possible pharmacophore model for an alternative vasodilator drug.

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Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

An article Spectroscopic and Theoretical Investigation of Color Tuning in Deep-Red Luminescent Iridium(III) Complexes WOS:000514488400018 published article about HIGHLY EFFICIENT; METAL-COMPLEXES; QUINOXALINE LIGANDS; 1ST EXAMPLES; PHOSPHORESCENT; EMISSION; BEARING; PHOTOPHYSICS; CONVERSION; DEVICES in [Stonelake, Thomas M.; Phillips, Kaitlin A.; Otaif, Haleema Y.; Edwardson, Zachary C.; Beames, Joseph M.; Pope, Simon J. A.] Cardiff Univ, Sch Chem, Cardiff CF10 3AT, Wales; [Horton, Peter N.; Coles, Simon J.] Univ Southampton, Fac Nat & Environm Sci, UK Natl Crystallog Serv, Chem, Southampton SO17 1BJ, Hants, England in 2020, Cited 60. Product Details of 98-97-5. The Name is Pyrazine-2-carboxylic acid. Through research, I have a further understanding and discovery of 98-97-5

A series of heteroleptic, neutral iridium(III) complexes of the form [Ir(L)(2)(N boolean AND O)] (where L = cyclometalated 2,3-disubstituted quinoxaline and N boolean AND O = ancillary picolinate or pyrazinoate) are described in terms of their synthesis and spectroscopic properties, with supporting computational analyses providing additional insight into the electronic. properties. The 10 [Ir(L)(2)(N boolean AND O)] complexes were characterized using a range of analytical techniques (including H-1, C-13, and F-19 NMR and IR spectroscopies and mass spectrometry). One of the examples was structurally characterized using X-ray diffraction. The redox properties were determined using cyclic voltammetry, and the electronic properties were investigated using UV-vis, time-resolved luminescence, and transient absorption spectroscopies. The complexes are phosphorescent in the red region of the visible spectrum (lambda(em) = 633-680 nm), with lifetimes typically of hundreds of nanoseconds and quantum yields ca. 5% in aerated chloroform. A combination of spectroscopic and computational analyses suggests that the long-wavelength absorption and emission properties of these complexes are strongly characterized by a combination of spin-forbidden metal-to-ligand charge-transfer and quinoxaline-centered transitions. The emission wavelength in these complexes can thus be controlled in two ways: first, substitution of the cyclometalating quinoxaline ligand can perturb both the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital levels (LUMO, Cl atoms on the ligand induce the largest bathochromic shift), and second, the choice of the ancillary ligand can influence the HOMO energy (pyrazinoate stabilizes the HOMO, inducing hypsochromic shifts).

Welcome to talk about 98-97-5, If you have any questions, you can contact Stonelake, TM; Phillips, KA; Otaif, HY; Edwardson, ZC; Horton, PN; Coles, SJ; Beames, JM; Pope, SJA or send Email.. Product Details of 98-97-5

Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem