Category: 33100-27-5

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, Recommanded Product: 1,4,7,10,13-Pentaoxacyclopentadecane

The diffusion NMR studies of crown ethers-cyclodextrin complexation process

Formation of complexes between crown ethers and cyclodextrins has been studied using diffusion measurements. The structures of the complexes have been proposed on the basis of the theoretical calculations and the results obtained. Relation between the structural parameters (rings’ diameter and symmetry) and the tendency of molecules’ interactions are discussed. Copyright

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Recommanded Product: 1,4,7,10,13-Pentaoxacyclopentadecane, 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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Odd-even alternation in molecular structure and self-assembling of some macrocyclic polyethers

It was found that the alternation of the melting points of 3n-crown-n retains its amplitude within a large range of the number of oxygen atoms (n?=?4?8) in the crown’s ring. This behavior is different from that observed for the compounds having n-alkyl chain, where the odd-even effect gradually disappears with increasing number of carbon atoms in the chain. So, the molecular structures of crown ethers containing in their rings even or odd number of oxygen atoms essentially differ from each other and the differences do not disappear when the ring increases. On the basis of temperature behavior of the increment of orientational entropy it was found that in liquid 12-crown-4 and 15-crown-5, the molecules self-organize into entities where the molecules are arranged in a head-to-tail way, while the molecules of 18-crown-6 are behaving quite differently: self-assemblies with antiparallel orientation of the molecular dipoles are predominant.

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Enthalpies of solvation of cyclic ethers in tetrachloromethane

The enthalpies of solvation of 12-crown-4, 15-crown-5, and 18-crown-6 ethers and 1,4-dioxane in tetrachloromethane at 298.15 K were determined. This series, except for 18-crown-6 ether, obeys the rule of additivity. The enthalpies of solvation of cyclic and linear ethers were compared.

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Crown Ethers as Guests of Cyclotetrachromotropylene in Water

The three crown ethers, 15-crown-5, 18-crown-6 and dibenzo<18>crown-6-, formed inclusion complexes with the cyclic tetramer host, cyclotetrachromotropylene, in water. Their stability constants K are 830, 510, and 8000 M-1 respectively at 25 deg C.

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Aluminium Bromide Ether Adducts: Structures in Solution and in the Solid State

Monoglyme forms a molecular 1:1 adduct with AlBr3 which dissociates into the ions AlBr2(DME)2+ and AlBr4- in DME, CH2Br2 and CDCl3 as solvents. A hexacoordinated Al center is present in the solid adduct AlBr3¡¤diglyme. The oxygen and bromine atoms are arranged in a meriodional configuration as shown by X-ray crystallography. However, in solution dissociation occurs into AlBr2(diglym)2+ and AlBr4-. Not unexpectedly, AlBr3 forms the adduct AlBr3¡¤2THF with tetrahydrofuran. The dioxane adduct AlBr3¡¤diox is polymeric in the solid state and has a chain structure with pentacoordinated trigonal-bipyramidal Al centers. The Br atoms are arranged in a slightly distorted trigonal plane. In solution, the presence of tetracoordinated Al is indicated by 27Al NMR spectroscopy. AlBr3 cleaves one of the C-O bonds of 12-crown-4 leading to the dimer of omega-bromo-tetra(ethyleneoxy)aluminium dibromide. This dimer contains pentacoordinated Al centers as proven by X-ray structure analysis. In contrast, the adduct of AlBr3 with 15-crown-5 is most likely an ionic compound, and is best described as [AlBr2(15-crown-5)]AlBr4 based on 27Al NMR and IR data.

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USE OF ALKALI- AND ALKALINE-EARTH-METAL IONS IN THE TEMPLATE SYNTHESIS OF 12-CROWN-4, 15-CROWN-5, AND 18-CROWN-6

The synthesis of 15-crown-5 and 18-crown-6 from bis(2-chloroethyl)ether and the appropriate polyethylene glycol has been investigated using alkali- and alkaline-earth-metal hydroxides as ‘template’ agents in comparison to tetra-n-butylammonium hydroxide.A classical template effect is observed for the alkali metals, giving optimum yields for Na and K in the synthesis of 15-crown-5 and 18-crown-6 respectively, but the action of the alkaline-earth metals is more complex, particularly for Mg and Ca where involvement with the counter ion prevents a good yield.The importance of base strenght in the synthesis of 15-crown-5 and 12-crown-4 is demonstrated, e.g. in the synthesis of 15-crown-5 the most effective base is found to be sodium methoxide.A novel synthesis of 12-crown-4, utilising lithium hydride as the base, gives a 24 percent yield, the highest yield so far reported.

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MACROHETEROCYCLES. VIII. SYNTHESIS AND COMPLEXING ABILITY OF TRICARBONYL ANALOGS OF CROWN ETHERS

The respective dicarboxylic acids were obtained by the reaction of glycolic, beta-phenyllactic, and thioglycolic acids with diglycolic anhydride.Thirteen new macrocyclic esters were obtained by the reaction of the chlorides of these acids with polyethylene glycols under the conditions of high dilution.The stability constants of the complexes of these compounds with potassium and sodium cations in alcohol were determined by a polarographic method.It was established that certain crown ether triones exhibit appresiable sodium/potassium selectivity.

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Hydrogen Peroxide Coordination to Cobalt(II) Facilitated by Second-Sphere Hydrogen Bonding

M(H2O2) adducts have been postulated as intermediates in biological and industrial processes; however, only one observable M(H2O2) adduct has been reported, where M is redox-inactive zinc. Herein, direct solution-phase detection of an M(H2O2) adduct with a redox-active metal, cobalt(II), is described. This CoII(H2O2) compound is made observable by incorporating second-sphere hydrogen-bonding interactions between bound H2O2and the supporting ligand, a trianionic trisulfonamido ligand. Thermodynamics of H2O2binding and decay kinetics of the CoII(H2O2) species are described, as well as the reaction of this CoII(H2O2) species with Group 2 cations.

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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, category: chiral-catalyst

Syntheses of nucleosides with 2?-spirolactam and 2?-spiropyrrolidine moieties as potential inhibitors of hepatitis C virus NS5B polymerase

To discover novel nucleosides as potential antiviral agents, 2?-spirolactam and 2?-spiropyrrolidine-containing nucleoside analogs were envisioned. Efficient synthetic routes were developed with an epoxide opening as the key step to establish the quaternary center at the 2? position, leading to the design and synthesis of uridine analogs 8 and 21, prodrugs 13-16, and cytidine analog 11.

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33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 33100-27-5, category: chiral-catalyst

Stereologous Crown Ethers: ?-Donor Participation in the Complexation of Cations?

In the framework of the “stereology concept” the new crown ethers 8, 9, and for comparison 11 have been synthesized and their stability constants with Ag+ ions determined by 1H NMR spectroscopy.The results may be interpreted as evidence for a ?-participation of aromatic nuclei of the ligands in the complexation of certain cations.

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 33100-27-5

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