Category: 14098-44-3

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Copper(II) bromide: A simple and selective monobromination reagent for electron-rich aromatic compounds

Copper(II) bromide was found to be a simple and efficient reagent for monobromination of electron-rich aromatic compounds at room temperature. The reaction proceeded smoothly with phenols, aryl alkyl ethers, and aromatic amines to afford the corresponding monobrominated product selectively in moderate to good yields. Copyright Taylor & Francis Group, LLC.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3, COA of Formula: C14H20O5

Electrophile-promoted Fe-to-N2 hydride migration in highly reduced Fe(N2)(H) complexes

One of the emerging challenges associated with developing robust synthetic nitrogen fixation catalysts is the competitive formation of hydride species that can play a role in catalyst deactivation or lead to undesired hydrogen evolution reactivity (HER). It is hence desirable to devise synthetic systems where metal hydrides can migrate directly to coordinated N2 in reductive N-H bond-forming steps, thereby enabling productive incorporation into desired reduced N2-products. Relevant examples of this type of reactivity in synthetic model systems are limited. In this manuscript we describe the migration of an iron hydride (Fe-H) to Nalpha of a disilylhydrazido(2-) ligand (FeNNR2) derived from N2via double-silylation in a preceding step. This is an uncommon reactivity pattern in general; well-characterized examples of hydride/alkyl migrations to metal heteroatom bonds (e.g., (R)MNR? ? M-N(R)R?) are very rare. Mechanistic data establish the Fe-to-Nalpha hydride migration to be intramolecular. The resulting disilylhydrazido(1-) intermediate can be isolated by trapping with CNtBu, and the disilylhydrazine product can then be liberated upon treatment with an additional acid equivalent, demonstrating the net incorporation of an Fe-H equivalent into an N-fixed product.

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Application of 14098-44-3, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3

Synthesis and structure of bis-crown-containing stilbenes

An improved procedure was proposed for the synthesis of stilbenes fused to two crown ether fragments at both benzene rings. The structure of new homologous symmetric bis-crown-containing stilbenes was determined by X-ray analysis. Relations were revealed between the size of the crown ether moiety and stilbene conformation in crystal and the mode of crystal packing. Conformational analysis of the prepared stilbenes in solution and in the solid state was performed by 1H and 13C NMR spectroscopy and by DFT quantum-chemical calculations.

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 14098-44-3 is helpful to your research., Application of 14098-44-3

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Related Products of 14098-44-3. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 14098-44-3, Name is Benzo-15-crown-5. In a document type is Article, introducing its new discovery.

Charge transfer complexes of crown ethers with neutral organic ?-acceptor, 2-dicyanoethylene 1,3-indane dione

The interaction of benzo-15-crown-5, dibenzo-18-crown-6 and dibenzo-24-crown-8 with 2-dicyanoethylene 1,3-indane dione in CH2Cl2 has been described in terms of the formation of 1:1 molecular complexes.The magnitude of association constants and thermodynamic parameters indicate cooperative interactions of oxygens with the acceptors.The 1H and 13C NMR spectra of the complexes show that ?-? interactions are a major source of ground state stabilization in these complexes.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3, Recommanded Product: Benzo-15-crown-5

Columnar and smectic liquid crystals based on crown ethers

Unsymmetrical benzo[15]-crown-5 ethers 5 with one lateral ortho-terphenyl unit bearing alkoxy side chains of varying chain lengths (C5-C14) were prepared from 3,4-dialkoxyphenylbromides 2. Complexation with metal salts MX (M = Na, Cs) afforded the corresponding derivatives MX¡¤5. The uncomplexed crown ethers 5h and 5i, with dodecyloxy and tetradecyloxy side chains, respectively, exhibit liquid crystalline properties. In the series of complexed crown ethers, liquid crystal properties appeared as early as NaI¡¤5f with C 9H19 side chains. Whereas the uncomplexed 5h,i form smectic mesophases, the complexed NaI¡¤5g and NaI¡¤5h exhibit textures typical of columnar mesophases. These results were supported by X-ray diffraction measurements (WAXS, SAXS), which revealed smectic (5h,i), rectangular columnar (NaI¡¤5g), and hexagonal columnar (NaI¡¤5h) mesophases. As the liquid crystalline phase might retain packing features of the solid-state structure, single-crystal X-ray analyses were also performed for some of the uncomplexed and complexed crown ether derivatives. The complex NaI3¡¤5a displays a sandwich-type structure, with the crown ether cores mutually antiperiplanar and maintaining an almost perfect crown conformation. In contrast, non-mesogenic uncomplexed crown ether 5b displays a layer-type ordering in the solid phase.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3, Application In Synthesis of Benzo-15-crown-5

Synthesis of cyclohexadienyl ruthenium arene complexes by replacement of acetonitrile ligands in [(eta5-C6H7)Ru(MeCN) 3+

Heating of the cyclohexadienyl ruthenium complex [(eta5-C 6H7)Ru(MeCN)3+ (1) with arenes results in replacement of acetonitrile ligands giving complexes [(eta5-C6H7)Ru(arene)+ (arene = toluene, o-xylene, hexamethylbenzene, p-toluidine, benzo-15-crown-5, ethyl ester of N-acetylphenylalanine) in 53-93% yields. Similar reaction of 1 with naphthalene produces labile complex [(eta5-C6H 7)Ru(naphthalene)+ which readily undergoes solvolysis in acetone. The reaction of 1 with 1,5-cyclooctadiene unexpectedly gives the benzene complex [(eta3,eta2-C8H 11)Ru(C6H6)+ in 44% yield, as a result of formal abstraction of two hydrogen atoms. Energy decomposition analysis revealed that the cyclohexadienyl ruthenium cation [(eta5- C6H7)Ru+ is less arenophilic then [CpRu + due to weaker orbital interaction with arenes. The structure of [(eta5-C6H7)Ru(benzo-15-crown-5)PF 6 was established by X-ray diffraction.

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Atomic carbon as a terminal ligand: Studies of a carbidomolybdenum anion featuring solid-state 13C NMR data and proton-transfer self-exchange kinetics

Anion [CMo(N[R]Ar)3]- (R = C(CD3)2CH3 or tBu, Ar = 3,5-C6H3Me2) containing one-coordinate carbon as a terminal substituent and related molecules have been studied by single-crystal X-ray crystallography, solution and solid-state 13C NMR spectroscopy, and density functional theory (DFT) calculations. Chemical reactivity patterns for [CMo(N[R]Ar)3]- have been investigated, including the kinetics of proton-transfer self-exchange involving HCMo(N[R]Ar)3, the carbidomolybdenum anion’s conjugate acid. While the Mo?C bond lengths in [K(benzo-15-crown-5)2][CMo(N[R]Ar)3] and the parent methylidyne, HCMo(N[R]Ar)3, are statistically identical, the carbide chemical shift of delta 501 ppm is much larger than the delta 282 ppm shift for the methylidyne. Solid-state 13C NMR studies show the carbide to have a much larger chemical shift anisotropy (CSA, 806 ppm) and smaller 95Mo-13C coupling constant (60 Hz) than the methylidyne (CSA = 447 ppm, 1JMoC = 130 Hz). DFT calculations on model compounds indicate also that there is an increasing MoC overlap population on going from the methylidyne to the terminal carbide. The pKa of methylidyne HCMo(N[R]Ar)3 is approximately 30 in THF solution. Methylidyne HCMo(N[R]Ar)3 and carbide [CMo(N[R]Ar)3]- undergo extremely rapid proton-transfer self-exchange reactions in THF, with k = 7 ¡Á 106 M-1 s-1. Besides being a strong reducing agent, carbide [CMo(N[R]Ar)3]- reacts as a nucleophile with elemental chalcogens to form carbon-chalcogen bonds and likewise reacts with PCl3 to furnish a carbon-phosphorus bond.

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Reference of 14098-44-3, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a patent, introducing its new discovery.

Synthesis of 4′-Vinylbenzo-3n-crown-n Ethers (4<=n<=10) 4'-Vinylbenzo-3n-crown-n ethers (4<=n<=10) are prepared by a "Cs-templated" cyclization reaction of catechol with dimesylates of oligoethylene glycols, acetylation of the resultant benzo-3n-crown-n ethers (4<=n<=10), reduction of the acyl group, and dehydration of the resultant alcohols with pyridinium tosylate. If you are interested in 14098-44-3, you can contact me at any time and look forward to more communication.Reference of 14098-44-3

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14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 14098-44-3, Product Details of 14098-44-3

Coordination chemistry for information acquisition and processing

In the 21st century, information has become the most valuable resource that is available to modern societies. Thus, great efforts have been made to develop new information processing and storage techniques. Chemistry can offer a wide variety of computing paradigms that are closely related to the natural processes found in living organisms (e.g., in the nervous systems of animals). Moreover, these phenomena cannot be reproduced easily by solely using silicon-based technology. Other great advantages of molecular-scale systems include their simplicity and the diversity of interactions that occur among them. Thus, devices constructed using chemical entities may be programmed to deal with different information carriers (photons, electrons, ions, and molecules), possibly surpassing the capabilities of classic electronic circuits.

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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 14098-44-3, Name is Benzo-15-crown-5, category: chiral-catalyst.

Novel crown ether functionalized imidazolium-based acidic ionic liquid catalyzed synthesis of pyrazole derivatives under solvent-free conditions

Abstract An innovatively designed novel crown ether functionalized imidazolium-based reusable acidic ionic liquid [crown ether MIm] [HSO4] has been efficiently implemented for the synthesis of pyrazole derivatives using various substituted enaminones, hydrazine hydrate and phenyl hydrazine under solvent-free conditions. Structural novelty and task efficiency of the catalyst, high yields of desired products, greener approach attributing high atom economy and solvent-free conditions render this protocol suitable to cope with the current demand in contemporary organic chemistry. The inventive idea of utilizing crown ether functionalized ionic liquid as a catalyst was for the first time demonstrated in this protocol.

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