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Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 4556-23-4, is researched, SMILESS is SC1=CC=NC=C1, Molecular C5H5NSJournal, Article, Research Support, Non-U.S. Gov’t, Angewandte Chemie, International Edition called Desulfonative Suzuki-Miyaura Coupling of Sulfonyl Fluorides, Author is Chatelain, Paul; Muller, Cyprien; Sau, Abhijit; Brykczynska, Daria; Bahadori, Maryam; Rowley, Christopher N.; Moran, Joseph, the main research direction is sulfonyl fluoride desulfonative Suzuki Miyaura coupling palladium; SuFEx; cross-coupling; heterocycles; palladium; reaction mechanisms.Safety of Pyridine-4-thiol.

Sulfonyl fluorides have emerged as powerful “”click”” electrophiles to access sulfonylated derivatives Yet, they are relatively inert towards C-C bond forming transformations, notably under transition-metal catalysis. Here, authors describe conditions under which aryl sulfonyl fluorides act as electrophiles for the Pd-catalyzed Suzuki-Miyaura cross-coupling. This desulfonative cross-coupling occurs selectively in the absence of base and, unusually, even in the presence of strong acids. Divergent one-step syntheses of two analogs of bioactive compounds showcase the expanded reactivity of sulfonyl fluorides to encompass both S-Nu and C-C bond formation. Mechanistic experiments and DFT calculations suggest oxidative addition occurs at the C-S bond followed by desulfonation to form a Pd-F intermediate that facilitates transmetalation.

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Recommanded Product: Pyridine-4-thiol. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about MoS2/graphene van der Waals heterojunctions combined with two-layered Au NP for SERS and catalysis analyse. Author is Lu, Weixi; Liu, Lu; Zhu, Tiying; Li, Zhaoxiang; Shao, Mingrui; Zhang, Chao; Yu, Jing; Zhao, Xiaofei; Yang, Cheng; Li, Zhen.

MoS2-plasmonic hybrid platforms have attracted significant interest in surfaceenhanced Raman scattering (SERS) and plasmon-driven photocatalysis. However, direct contact between the metal and MoS2 creates strain that deteriorates the electron transport across the metal/ MoS2 interfaces, which would affect the SERS effect and the catalytic performance. Here, the MoS2/graphene van der Waals heterojunctions (vdWHs) were fabricated and combined with two-layered gold nanoparticles (Au NP) for SERS and plasmon-driven photocatalysis analyze. The graphene film is introduced to provide an effective buffer layer between Au NP and MoS2, which not only eliminates the inhomogeneous contact on MoS2 but also benefits the electron transfer. The substrate exhibits excellent SERS capability realizing ultra-sensitive detection for 4-pyridinethiol mols. Also, the surface catalytic reaction of p-nitrothiophenol (PNTP) to p,p-dimercaptobenzene (DMAB) conversion was in situ monitored, demonstrating that the vdWHs-plasmonic hybrid could effectively accelerate reaction process. The mechanism of the SERS and catalytic behaviors are investigated via experiments combined with theor. simulations (finite element method and quantum chem. calculations).

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis of some derivatives of 2-nitroimidazole with potential anti-Trichomonas activity》. Authors are Lancini, G. C.; Maggi, N.; Sensi, P..The article about the compound:5-Chloro-1-methyl-4-nitroimidazolecas:4897-25-0,SMILESS:C1=NC(=C(Cl)[N]1C)[N+]([O-])=O).HPLC of Formula: 4897-25-0. Through the article, more information about this compound (cas:4897-25-0) is conveyed.

2-Nitroimidazole (I) (azomycin), an antibiotic isolated from a Streptomyces strain, was submitted to various substitutions, and the reaction products tested for antiTrichomonas activity. In order to prepare I a Streptomyces was cultivated at 28° for 96 hrs., the pH of the culture adjusted to 8, the mycelium filtered off, and the filtrate acidified to pH. Extraction of a 10-l. portion with AcOEt, followed by evaporation of the solvent yielded 0.7 g. I, m. 284° (decomposition)(MeOH). (Nakamura, CA 50, 15897g). I (1.13 g.) was added at 0° to a mixture of 15 ml. 86% HNO3 and 5 ml. Ac2O, the solution heated 2 hrs. at 100° and 30 min. at 115° (bath temperature), and the product, which precipitated upon addition of 150 ml. ice-H2O, extracted with AcOEt, to yield 0.72 g. 2,4(5)-dinitroimidazole (II), 266-8° (MeOH). I (1.13 g.) in 200 ml. AcOH was mixed with 10 ml. 20% Br in AcOH, the mixture refluxed until the color disappeared, concentrated in vacuo, and the residue treated with H2O to give 0.9 g. 2,4,5-tribromoimidazole (III), m. 219-21° (MeOH or CHCl3). suspension of 1 g. II in 10 ml. ethylene chlorohydrin was refluxed 15 hrs., the solvent evaporated, and the residue treated with 5 ml. CHCl3 to yield 0.7 g. 4(5)-nitro-5(4)-chloroimidazole (IV), m. 214-16°. IV (0.2 g.) was suspended in 30 ml. 1% ethereal CH2N2 and the mixture kept at room temperature 12 hrs., and concentrated to yield 0.06 g. 1-methyl-4-nitro5-chloroimidazole (V), m. 146-8° (EtOH). From the mother liquor, 0.10 g. isomeric 1-methyl-4-chloro-5-nitroimidazole (VI), m. 76-8° (C6H6-petr. ether), was isolated. To 1.36 g. I in 100 ml. absolute EtOH were added 1.2 g. pyrrolidine-HCl and 1.25 ml. 38% aqueous HCHO, the mixture refluxed 12 hrs., cooled to 50°, filtered, and the filtrate concentrated to yield 1.12 g. 2-nitro-4(5)-pyrrolidinomethylimidazole (VII), m. 212-15° (EtOH). Similar treatment of 1.36 g. I with 1.4 g. morpholine-HCl gave 1.25 g. 2-nitro-4(5)-morpholinomethyliminazole (VIII), m. 156-8° (EtOH). The ultraviolet spectra of VII and VIII were given. Attempts to sulfonate or tosylate I only yielded starting material. All of the new compounds discussed were active against T. vaginalis.

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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 4556-23-4, is researched, Molecular C5H5NS, about Evaluation of the intrinsic pH sensing performance of surface-enhanced Raman scattering pH probes, the main research direction is hydrogen ion sensing surface enhanced Raman scattering probe.Computed Properties of C5H5NS.

Surface-enhanced Raman spectroscopy (SERS) has shown a high promise in microenvironmental pH sensing in recent years, which is significant for understanding various biol. processes and multiphase chem. reactions. Generally, the pH sensing capability of the SERS substrate is realized by the surface functionalization of the substrate with a pH sensitive mol. (pH probe). However, to the best of our knowledge, there is no systematic evaluation of mainstream SERS pH probes reported in literatures on the pH response range, resistance to co-present ions, accuracy and stability. Here a systematic anal. of common pH probes, including 4-mercaptobenzoic acid (4-MBA), 4-mercaptopyridine (4-Mpy), 2-aminobenzenethiol (2-ABT), and 4-aminothiophenol (4-ATP) has been carried out with a series of performance assessments. D. functional theory (DFT) calculation was carried out to investigate the vibration mode in SERS spectra. Moreover, the practical application comparison was conducted with urine samples. Overall, 4-MBA showed an excellent sensing performance in the neutral and alk. area, and meanwhile, the pH response of 4-Mpy and 4-ATP was inclined to the acidic and neutral range. The pH probe 2-ABT is not recommend because of the poor performance.

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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.Gaudet, Alexandre; Portier, Lucie; Mathieu, Daniel; Hureau, Maxence; Tsicopoulos, Anne; Lassalle, Philippe; Caires, Nathalie De Freitas researched the compound: 5-Chloro-1-methyl-4-nitroimidazole( cas:4897-25-0 ).COA of Formula: C4H4ClN3O2.They published the article 《Cleaved endocan acts as a biologic competitor of endocan in the control of ICAM-1-dependent leukocyte diapedesis》 about this compound( cas:4897-25-0 ) in Journal of Leukocyte Biology. Keywords: sepsis diapedesis respiratory distress syndrome leukocyte ICAM1 p14 endocan; acute lung injury; cleaved endocan; endocan; inflammation; leukocyte diapedesis; p14. We’ll tell you more about this compound (cas:4897-25-0).

Dysregulated leukocyte diapedesis is a major contributor to acute severe inflammatory states like sepsis and acute respiratory distress syndrome, which are common conditions in critically ill subjects. Endocan is a circulating proteoglycan that binds to the leukocyte integrin LFA-1 and blocks its interaction with its endothelial ligand ICAM-1, subsequently leading to the inhibition of leukocyte recruitment. Recent data have highlighted the hypothetic role of p14, endocan′s major catabolite found in the bloodstream of septic patients, as a potential antagonist of endocan, thus participating in the regulation of acute inflammation. We hereby characterize the role of p14 as a biol. competitor of endocan, through assessment of its mol. interactions with LFA-1, endocan, and ICAM-1, as well as its effects on human leukocyte trafficking. Using immunodetection assay, we report that p14 can bind to LFA-1, thus inhibiting the interaction between LFA-1 and endocan, which in turn leads to the restoration of the ICAM-1/LFA-1 interaction. In primary human T cells trafficking assays, we underline the absence of effect of p14 on ICAM-1-dependent adhesion and migration, as well as on transendothelial migration. However, in those models, p14 reverses the antimigratory effect of endocan. To conclude, our study supports the hypothesis of an antagonistic role of p14 vs. endocan in its effect on the LFA-1/ICAM-1-dependent human leukocyte recruitment.

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Safety of Pyridine-4-thiol. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Overcurrent Electrodeposition of Fractal Plasmonic Black Gold with Broad-Band Absorption Properties for Excitation-Immune SERS. Author is Yu, Renpeng; Wang, Jingyu; Han, Mei; Zhang, Mengyao; Zeng, Pei; Dang, Weiqi; Liu, Jianfang; Yang, Zhilin; Hu, Jiawen; Tian, Zhongqun.

The dependence of plasmon resonance on the size, shape, and interparticle spacing of single, isolated nanostructures inherently limits their light-harvesting capability to a narrow spectral band. Here, we report a facile overcurrent electrodeposition strategy to prepare fractal plasmonic black gold (B-Au) with broad-band absorption properties (over 80% throughout the range of 300-1800 nm). The broad-band absorption properties are attributed to the excitation of multiple plasmons in the B-Au, which results in strong light-matter interaction over a broad-band spectral window. Consequently, the B-Au can produce strong broad-band surface-enhanced Raman scattering (SERS) regardless of the excitation light used. These findings demonstrate that the fractal B-Au allows efficient utilization of broad spectral photons and opens up exciting opportunities for highly sensitive SERS detection, photocatalysis, and photovoltaic devices.

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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.Shafaati, A.; Clark, B. J. researched the compound: 5-Chloro-1-methyl-4-nitroimidazole( cas:4897-25-0 ).Recommanded Product: 4897-25-0.They published the article 《Determination of azathioprine and its related substances by capillary zone electrophoresis and its application to pharmaceutical dosage forms assay》 about this compound( cas:4897-25-0 ) in Drug Development and Industrial Pharmacy. Keywords: azathioprine determination pharmaceutical capillary zone electrophoresis; imidazole azathioprine determination capillary zone electrophoresis. We’ll tell you more about this compound (cas:4897-25-0).

The development of a stability-indicating capillary zone electrophoresis (CZE) method for the determination of azathioprine (AZA) and its related substances in bulk and dosage forms is described. Theophylline was used as an internal standard to improve quant. results. The method was fully validated in terms of repeatability (RSD for migration time and peak area ratio were 0.15 and 0.60%, resp.), reproducibility (RSD of peak area ratio was 0.84%), linearity at 2 ranges of the azathioprine concentration, limits of detection and quantitation, and robustness. The method was applied for determination of the drug in bulk and a com. tablet dosage form (recovery 98.3-101.3%) and in powder for injection (recovery 98.7-100.6%). The method was fast and reliable for the determination of AZA and its related substances in bulk and dosage forms.

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Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Base-Activated Latent Heteroaromatic Sulfinates as Nucleophilic Coupling Partners in Palladium-Catalyzed Cross-Coupling Reactions.Electric Literature of C5H5NS.

Heteroaromatic sulfinates, e.g., I, are effective nucleophilic reagents in Pd(0)-catalyzed cross-coupling reactions with aryl halides e.g., 4-methoxy-bromobenzene. However, metal sulfinate salts can be challenging to purify and solubilize in reaction media, and are not tolerant to multi-step transformations. Here base-activated, latent sulfinate reagents: β-nitrile and β-ester sulfones were introduced. It was shown that, under the cross-coupling conditions, these species generate the sulfinate salt in situ, which then undergo efficient palladium-catalyzed desulfinative cross-coupling with (hetero)aryl bromides to deliver a broad range of biaryls, e.g., II. These latent sulfinate reagents have proven to be stable through multi-step substrate elaboration, and amenable to scale-up.

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Abu Safieh, Kayed A.; Darras, Fouad H.; Ayoub, Mikdad T.; El-Abadelah, Mustafa M.; Sabri, Salim S.; Voelter, Wolfgang published an article about the compound: 5-Chloro-1-methyl-4-nitroimidazole( cas:4897-25-0,SMILESS:C1=NC(=C(Cl)[N]1C)[N+]([O-])=O ).Application In Synthesis of 5-Chloro-1-methyl-4-nitroimidazole. 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:4897-25-0) through the article.

A synthesis of model 8-substituted 12-methyl-12H-imidazo[4′,5′:2,3][1,4]diazepino[6,7,1-jk]carbazoles I (R = Me, 4-tolyl, 2-thienyl), based on the classical Bischler-Napieralski method, is described. Thus interaction of carbazole with 5-chloro-1-methyl-4-nitro-1H-imidazole (in the presence of NaH) produced the corresponding 9-(1-methyl-4-nitro-1H-imidazol-5-yl)-9H-carbazole. Subsequent chem. reduction of the nitro group into the resp. amino derivative and acylation of the resulting amino group furnished the resp. amides. Cyclocondensation of the latter, using polyphosphoric acid under Bischler-Napieralski conditions, delivered the target compounds The structures of these new pentacyclic heterocycles were supported by IR, MS, and NMR.

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COA of Formula: C4H4ClN3O2. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Preparation of derivatives of 1-(2-pyrimidinyl)piperazine as potential antianxiety, antidepressant, and antipsychotic agents. Author is Becker, Irwin.

This paper describes the preparation of twenty-eight derivatives of 1-(2-pyrimidinyl)piperazine, e.g. I, as potential antianxiety, antidepressant, and antipsychotic agents. In twenty-six of the preparations, a chloro-substituted nitrogen heterocycle was caused to reacted with an excess of 1-(2-pyrimidinyl)piperazine in the absence of solvent.

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