Month: April 2022

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about A rotating disk electrode study on catalytic activity of iron(II) phthalocyanine-modified electrodes for oxygen reduction in acidic media, the main research direction is iron phthalocyanine oxygen reduction acidic media rotating disk electrode.Application In Synthesis of Pyridine-4-thiol.

Catalytic activity of monometric metal macrocycles for oxygen reduction reaction (ORR) was investigated using rotating disk electrode voltammetry in acidic media. Iron(II) phthalocyanines (FePc) and cobalt(II) tetraphenylporphyrins (CoTPP) were immobilized on Au surfaces through mol. wires with different terminal groups of pyridine and isocyanide. The measured ORR behavior of FePc was largely influenced by the axial ligand while CoTPP promoted only the two-electron reaction regardless of the axial ligand. The FePc immobilized with pyridine was easily detached from the surface under the ORR condition, and was able to promote the four-electron reaction only under the high overpotential application. The FePc with isocyanide was more stable with the activity for the four-electron reaction, due to stronger electron donation to Fe central ions.

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Related Products of 4897-25-0. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Molecular Mechanisms for CFIm-Mediated Regulation of mRNA Alternative Polyadenylation. Author is Zhu, Yong; Wang, Xiuye; Forouzmand, Elmira; Jeong, Joshua; Qiao, Feng; Sowd, Gregory A.; Engelman, Alan N.; Xie, Xiaohui; Hertel, Klemens J.; Shi, Yongsheng.

Alternative mRNA processing is a critical mechanism for proteome expansion and gene regulation in higher eukaryotes. The SR family proteins play important roles in splicing regulation. Intriguingly, mammalian genomes encode many poorly characterized SR-like proteins, including subunits of the mRNA 3′-processing factor CFIm, CFIm68 and CFIm59. Here we demonstrate that CFIm functions as an enhancer-dependent activator of mRNA 3′ processing. CFIm regulates global alternative polyadenylation (APA) by specifically binding and activating enhancer-containing poly(A) sites (PASs). Importantly, the CFIm activator functions are mediated by the arginine-serine repeat (RS) domains of CFIm68/59, which bind specifically to an RS-like region in the CPSF subunit Fip1, and this interaction is inhibited by CFIm68/59 hyper-phosphorylation. The remarkable functional similarities between CFIm and SR proteins suggest that interactions between RS-like domains in regulatory and core factors may provide a common activation mechanism for mRNA 3′ processing, splicing, and potentially other steps in RNA metabolism

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Name: 2,4,5-Triphenylimidazole. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2,4,5-Triphenylimidazole, is researched, Molecular C21H16N2, CAS is 484-47-9, about Fe3O4@SiO2/Bipyridinium Nanocomposite as a Magnetic and Recyclable Heterogeneous Catalyst for the Synthesis of Highly Substituted Imidazoles Via Multi-Component Condensation Strategy. Author is Hosseini, Sara; Kiasat, Ali Reza; Farhadi, Asadollah.

A magnetically separable catalyst consisting bipyridinium supported on silica coated Fe3O4 nanoparticles was prepared Fe3O4@SiO2/bipyridinium nanocomposite (Fe3O4@SiO2/BiPy+22Cl-) was used as a recyclable heterogeneous catalyst for the synthesis of various multi-substituted imidazoles via multi-components cyclocondensation reaction of 1,2-dicarbonyl compounds, aldehydes and N-source compounds under solvent-free conditions. This catalyst afforded the imidazole derivatives as key intermediates in pharmaceutical chem. in very short reaction times. The catalyst is readily recovered by simple magnetic decantation and can be recycled several times with no significant loss of catalytic activity. However, this catalyst was characterized by FT-IR, TGA, SEM and VSM.

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Product Details of 17524-05-9. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Bis(acetylacetonato)dioxomolybdenum(VI), is researched, Molecular C10H14MoO6, CAS is 17524-05-9, about Mo-catalysis-assisted expeditious synthesis of N-doped erythrocyte-like hollow porous carbons for sodium storage.

Rational design and construction, with appropriate approaches to achieve desired hollow interiors in carbonaceous materials, is a pivotal issue remaining to be resolved in realizing their widespread practical availability. Herein, we aim to provide a feasible and novel strategy to synthesize N-doped hollow porous carbons with pore sizes in the range of 0.5-1 nm through Mo-catalysis-assisted interfacial microemulsion polymerization combined with a carbonization process on a large scale. The morphol. of the as-prepared carbon materials can be controlled from solid spheres to erythrocyte-like hollow structures, and the particle sizes can be tuned from ∼50 nm to ∼10 μm. Such unusual hollow porous architectures might offer unique structure-dependent physiochem. properties and promising applications in many areas. As an example, we demonstrate that the erythrocyte-like carbon could exhibit remarkable electrochem. performance as an anode for sodium-ion batteries.

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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called A new look into the quantum chemical and spectroscopic investigations of 5-chloro-1-methyl-4-nitroimidazole, published in 2014-05-05, which mentions a compound: 4897-25-0, mainly applied to chloromethylnitroimidazole IR Raman vibrational assignment DFT; 5-Chloro-1-methyl-4-nitroimidazole; DFT; FT-Raman; FTIR; Fukui functions; NMR, Recommanded Product: 4897-25-0.

Optimized geometrical structural parameters, harmonic vibrational frequencies, natural bonding orbital anal. and frontier MOs are determined by B3LYP and B3PW91 methods. The exact geometry of 5-chloro-1-methyl-4-nitroimidazole is determined through conformational anal. The exptl. observed IR and Raman bands have been assigned and analyzed. The 13C and 1H NMR chem. shifts of the compound are investigated. The total electron d. and mol. electrostatic potentials are determined The electrostatic potential (electron + nuclei) distribution, mol. shape, size and dipole moments of the mol. have been displayed. The energies of the frontier MOs and LUMO-HOMO energy gap are measured. The possible electronic transitions of the mol. are studied by TD-DFT method along with the UV-Visible spectrum. The structure-activity relationship of the compound is also investigated by conceptual DFT methods.

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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Colloidally synthesized defect-rich MoSe2 nanosheets for superior catalytic activity, published in 2019-04-30, which mentions a compound: 17524-05-9, mainly applied to molybdenum diselenide nanosheet superior catalytic activity, Formula: C10H14MoO6.

Transition metal dichalcogenide (TMD) nanosheets (NSs) with defect-rich and vertically aligned edges are highly advantageous for various catalytic applications. However, colloidal synthesis of defect-rich NSs with thickness variation has been a challenging task. Here, we report a colloidal synthesis of 2H-MoSe2 NSs having a large number of defects and vertically aligned edges, where the thickness is varied by changing the amount of coordinating solvent. The Se-vacancies in these NSs have introduced defect sites which are corroborated by the presence of addnl. vibration modes in Raman spectra. These NSs exhibit electrocatalytic hydrogen evolution reaction performances with a low overpotential (210-225 mV) at 10mAcm-2 c.d. and a small Tafel slope (54-68 mV per decade). Moreover, these MoSe2 NSs are also employed as counter electrodes (CEs) for the fabrication of dye sensitized solar cells via a cost-effective and simplified procedure. The power conversion efficiencies of 7.02±0.18%, comparable with Pt CE (7.84±0.10%) could be routinely achieved. These results demonstrate a novel synthetic strategy to prepare layered TMDs with superior catalytic applications.

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Related Products of 4897-25-0. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Rapid-mix studies on the anomalous radiosensitization of mammalian cells by 5-chloro-1-methyl-4-nitroimidazole. Author is Watts, M. E.; Hodgkiss, R. J.; Sehmi, D. S.; Woodcock, M..

5-Chloro-1-methyl-4-nitroimidazole (I) [4897-25-0] (0.1 mmol/dm3) gave a sensitizer enhancement ratio (SER) of 1.7 when irradiated under steady-state conditions with 250 kVp x-rays (dose rate 3.93 Gy/min) using V79 379A cells in Eagles MEM with or without 15% fetal calf serum. Irradiation with 25 MeV electrons in a rapid-mix apparatus with 0.15 mmol I/dm3 flowing through both tubes gave an SER of 1.5 in hypoxia. No change in SER was observed when air or O-saturated I solution (0.15 mmol/dm3) in Eagle’s MEM was added to cells irradiated in hypoxic I solution (0.15 mmol/dm3) 17 ms after irradiation was complete. The fact that adding O to prevent dehalogenation of the radical did not reduce the SER suggested that elimination of the ortho-substituted ‘leaving group’ is not responsible for the observed, anomalously high efficiency.

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Pei, Chunzhe; Zong, Jiarui; Han, Shanglin; Li, Bin; Wang, Baiquan published an article about the compound: 7-Methoxy-1H-indole-3-carboxylic acid( cas:128717-77-1,SMILESS:O=C(C1=CNC2=C1C=CC=C2OC)O ).Synthetic Route of C10H9NO3. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:128717-77-1) through the article.

The transition-metal-catalyzed direct carboxylation of an unactivated C-H bond is rarely reported, and no example of catalysis using abundant and cheap nickel has been reported. In this work, the first Ni-catalyzed direct carboxylation of an unactivated C-H bond under an atm. pressure of CO2 is reported. This method affords moderate to high carboxylation yields of various Me carboxylates under mild conditions. Preliminary mechanistic studies reveal that a Ni(0)-Ni(II)-Ni(I) catalytic cycle may be involved in this reaction.

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Electric Literature of C4H4ClN3O2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Mutational analysis of human glutathione transferase A2-2 identifies structural elements supporting high activity with the prodrug azathioprine. Author is Moden, Olof; Zhang, Wei; Mannervik, Bengt.

Glutathione transferase (GST) A2-2 is the human enzyme displaying the highest catalytic activity with the prodrug azathioprine (Aza). The reaction releases pharmacol. active 6-mercaptopurine by displacing the imidazole moiety from the Aza mol. The GST-catalyzed reaction is of medical significance, since high rates of Aza activation may lead to adverse side effects in treated patients. The present study involves structure-activity relationships in GST A2-2 variants. Chimeric GSTs were previously generated by DNA shuffling and two peptide segments, one N-terminal and one C-terminal, were identified as primary determinants of Aza activity. The segments contain several residues of the substrate-binding H-site and their significance for supporting high Aza activity was investigated. Substitution of the corresponding two small regions in the low-activity human GST A3-3 or rat GST A3-3 by the human GST A2-2 segments generated chimeras with ∼10-fold enhanced Aza activity. The H-site residues Met208 and Leu213 in the C-terminal segment of GST A2-2 were mutated to produce a library with all possible residue combinations. At a calculated 93% library coverage, all of the 1880 mutants examined showed wild-type or decreased Aza activity, even though some retained activities with alternative substrates, further emphasizing the importance of this region for the targeted activity.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 2,4,5-Triphenylimidazole, is researched, Molecular C21H16N2, CAS is 484-47-9, about An efficient multicomponent synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles catalyzed by a magnetic nanoparticle supported Lewis acidic deep eutectic solvent, the main research direction is imidazole preparation green chem ultrasound irradiation; benzil benzaldehyde ammonium acetate multicomponent; aniline benzaldehyde benzil ammonium acetate multicomponent; magnetic nanoparticle Lewis acid deep eutectic solvent catalyst.COA of Formula: C21H16N2.

A mild and highly efficient reaction for the synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles I (R = 2-hydroxyphenyl, 2-fluorophenyl, 1H-indol-3-yl, etc.; R1 = H, phenyl) catalyzed by a magnetically supported Lewis acidic deep eutectic solvent on magnetic nanoparticles (LADES@MNP) has been developed via one-pot multicomponent processes under solvent-free sonication. These reactions have good to excellent yields, mild conditions, and work-up simplicity. This method represents a new method for the preparation of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles I. More importantly, LADES@MNP can be easily recovered by magnetic separation and reused five times without significant loss of catalytic activity.

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