Tag: M.W:200-300

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 14098-44-3, C14H20O5. A document type is Article, introducing its new discovery., Recommanded Product: 14098-44-3

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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Chiral Catalysts,
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In an article, published in an article, once mentioned the application of 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane,molecular formula is C10H20O5, is a conventional compound. this article was the specific content is as follows.Application In Synthesis of 1,4,7,10,13-Pentaoxacyclopentadecane

Photochemically induced radical transformation of C(sp3)-H bonds to C(sp3)-CN bonds

A general protocol for direct transformation of unreactive C(sp 3)-H bonds to C(sp3)-CN bonds has been developed. The C-H activation was effected by photoexcited benzophenone, and the generated carbon radical was subsequently trapped with tosyl cyanide to afford the corresponding nitrile in a highly efficient manner. The present methodology is widely applicable to versatile starting materials and, thus, serves as a powerful tool for selective one-carbon elongation for construction of architecturally complex molecules.

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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.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, Safety of 1,4,7,10,13-Pentaoxacyclopentadecane

Tuning binding of rubidium ions to planar and curved negatively charged pi surfaces

Two new rubidium salts of the bowl-shaped corannulene monoanion radical C20H10?- (1?-), [Rb(15-crown-5)2+][C20H10 -] (2) and [Rb(dicyclohexano-18-crown-6)+][C 20H10-] (3), have been synthesized and structurally characterized in this work. An excess of 15-crown-5 ether provided full encapsulation of the rubidium ion in [Rb(15-crown-5)2] +, which precluded metal-directed pi interactions with the anionic surface of C20H10?- in the solid-state structure of 2. The use of more sterically demanding dicyclohexano-18-crown-6 ether prevented the formation of polymeric chains previously seen with 18-crown-6 ether and favored the isolation of the discrete contact ion pair 3. Complex 3 is built on a convex eta6 coordination of Rb+ to C20H10?-, reaffirming the exo-binding preference of rubidium ions toward the singly charged corannulene bowl. A rubidium salt of the planar coronene monoanion radical C24H 12?- (4?-), [Rb(18-crown-6) +][C24H12-] (5), has also been prepared and structurally characterized to reveal a new binding mode of C 24H12?-. The analysis of the X-ray structure of 5, augmented by DFT calculations, confirmed the existence of strong C-H…pi interactions between the crown ether and charged surface of C24H12?-. These interactions result in a good alignment of matching in size crown ether and coronene moieties, thereby being responsible for the formation of a hub-bound coronene product. DFT calculations were also used to follow the spin density distribution in the [Rb(18-crown-6)][C24H12] system as well as in original fragments.

The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 33100-27-5 is helpful to your research., Safety of 1,4,7,10,13-Pentaoxacyclopentadecane

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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.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Product Details of 14098-44-3. In my other articles, you can also check out more blogs about 14098-44-3

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23190-16-1, Name is (1R,2S)-(?)-2-Amino-1,2-diphenylethanol, molecular formula is C6H5CH(NH2)CH(C6H5)OH, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 23190-16-1, Product Details of 23190-16-1

Design and synthesis of new bidentate alkoxy-NHC ligands for enantioselective copper-catalyzed conjugate addition

A new family of chiral alkoxy-N-heterocyclic carbene (NHC) ligands has been designed for the enantioselective copper-catalyzed conjugate addition of dialkylzincs to enones. These new bidentate NHC ligands were synthesized in high overall yields using a five-step procedure starting from commercially available beta-aminoalcohols. Influence of the temperature, base, solvent and copper source were studied in order to optimize the stereoselectivity of the addition. High reactivity and excellent enantioselectivity were obtained at ambient temperature with a range of cyclic enones and dialkylzinc. Addition to acyclic enones has also been studied.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Product Details of 23190-16-1. In my other articles, you can also check out more blogs about 23190-16-1

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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.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.category: chiral-catalyst. In my other articles, you can also check out more blogs about 14098-44-3

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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. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, Computed Properties of C10H20O5

Effect of framework Si/Al ratio and extra-framework aluminum on the catalytic activity of Y zeolite

The effect of the Si/Al ratio of the framework on the intrinsic activity of Br¡ãnsted acid sites in Y zeolite was investigated by monomolecular cracking of propane and physicochemical characterization. Samples with different Si/Al ratios were obtained by synthesis and by post-synthesis treatments. Two samples with Si/Al ratios of 3.3 and 3.6 exhibited characteristic features similar to those of commercial Y zeolite with a Si/Al ratio of 2.6, but they were more stable. An ultrastable Y (HUSY) was treated with ammonia and ethylenediaminetetraacetic acid (EDTA) to remove extra-framework aluminum (EFAl). The rates per gram increased with Si/Al ratio, but the activation energies did not depend on the Si/Al ratio or on the presence of EFAl. This implies that the intrinsic activity of the Br¡ãnsted acid sites that participate in the reaction is identical in all the samples. The enhanced activity of the samples with Si/Al ratios up to 5.0 is attributed to the creation of more isolated Br¡ãnsted acid sites, which are active in this demanding reaction. The removal of EFAl did not affect the intrinsic catalytic activity but increased the number of catalytically active framework Br¡ãnsted acid sites.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Computed Properties of C10H20O5, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 33100-27-5, in my other articles.

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Chiral Catalysts,
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Reference of 33100-27-5, 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.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a patent, introducing its new discovery.

Heteroaromatic derivatives

An aromaheterocyclic derivative represented by the formula: STR1wherein Z is a group represented by the following formula: STR2wherein Ar 1 is a phenyl group or a phenyl group substituted with a halogen atom or an alkyl group of 1 to 5 carbon atoms, R 2 is an alkyl group of 1 to 5 carbon atoms, Y is a hydrogen atom, a mercapto group, an alkylthio group of 1 to 5 carbon atoms, an amino group or an amino group substituted with one or two alkyl groups having 1 to 5 carbon atoms, Ar 2 is a phenyl group of one or two substituents selected from the group consisting of a halogen atom, an alkyl group of 1 to 5 carbon atoms, an alkoxy group of 1 to 5 carbon atoms, a hydroxyl group and a trifluoromethyl group, or a phenyl group, B 1 -B 2 is CH–CO or C C(R 1) (wherein R 1 is a hydrogen atom or an alkyl group of 1 to 5 carbon atoms), and n is an integer of 1 to 4, or a pharmaceutically acceptable salt thereof, which is a dopamine D 4 receptor antagonist compound having an antipsychotic action without causing extrapyramidal diseases.

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Chiral Catalysts,
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In an article, published in an article, once mentioned the application of 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane,molecular formula is C10H20O5, is a conventional compound. this article was the specific content is as follows.Recommanded Product: 33100-27-5

Reversible Single-Crystal-to-Single-Crystal Transformation and Magnetic Change of Nonporous Copper(II) Complexes by the Chemisorption/Desorption of HCl and H2O

Vapor-responsive magnetic materials are highly promising for applications as chemical switches or sensors. Compared with porous materials, nonporous species benefit in overcoming the intrinsic conflict between magnetic exchange and porosity but usually suffer from the powdering of single crystals, which hinders the understanding of the structural nature of vapor response and magnetic switch. Single-crystal-to-single-crystal (SCSC) transformation of nonporous compounds through the desorption/absorption of gaseous HCl is unprecedented. Reported here is a discrete nonporous copper(II) complex, (H3O)[K(15-crown-5)2][CuCl4], that exhibits reversible SCSC transformation and magnetic change by the chemisorption/desorption of HCl and H2O. Significant changes in the coordination number (4 ? 3), space group (P1? ? P21/c), color (green ? red), and magnetic behavior (antiferromagnetic ? paramagnetic) were found during the SCSC transformation.

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Chiral Catalysts,
Chiral catalysts – SlideShare