Month: November 2022

Khan, N. M. published the artcileElectrical conduction of PMMA/PLA doped lithium bis(oxalato) borate based hybrid gel polymer electrolyte, COA of Formula: C10H22O5, the main research area is elec conduction polylactic acid polymethylmethacrylate hybrid gel polymer electrolyte.

The present work highlights the investigation of elec. conduction properties of gel polymer electrolyte (GPE) based poly(methyl) methacrylate (PMMA) and poly(lactic) acid (PLA) blend doped with various compositions of lithium bis(oxalato) borate. The impedance anal. revealed the GPE systems exhibit maximum ionic conductivity of 1.37 x 10-3 S cm-1 for sample PLi20. The elec. properties based on the dielec. permittivity of entire samples decreased with increasing frequency and followed the trend of ionic conductivity Further anal. was carried out to determine the dielec. response at different temperatures, focusing on the most conducting sample (PLi20). Both dielec. constant and loss increase with the increasing temperature, which suggested that total polarization has occurred. In conclusion, the samples with 20 wt% composition of LiBOB exhibit the highest conducting properties which significantly provides good elec. performance for the application in energy storage devices.

Materials Today: Proceedings published new progress about Dielectric constant. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, COA of Formula: C10H22O5.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Mizuno, Kazuhiko published the artcileA convenient synthesis of aryl vinyl ethers by use of tetrabutylammonium hydrogen sulfate, Synthetic Route of 622-86-6, the main research area is aryl vinyl ether; dehydrohalogenation haloethoxybenzene.

RC6H4OCH:CH2 (I; R = H, Me, Me3C, MeO, CN, halo, benzo) were prepared by dehydrohalogenation of RC6H4OCH2CH2X (II) in the presence of Bu4N+ HSO4- (III). Thus, 50% aqueous NaOH and 5 mmol III were added to a solution of 5 mmol II (R = 4-Me3C, X = Cl) in C6H6 and the mixture stirred 1 h at room temperature to give 97% I (R = 4-Me3C). Similarly prepared were 10 addnl. I.

Synthesis published new progress about Dehydrohalogenation. 622-86-6 belongs to class ethers-buliding-blocks, name is (2-Chloroethoxy)benzene, and the molecular formula is C8H9ClO, Synthetic Route of 622-86-6.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Hashimoto, Kei published the artcileSolvation Structure of Poly(benzyl methacrylate) in a Solvate Ionic Liquid: Preferential Solvation of Li-Glyme Complex Cation, HPLC of Formula: 143-24-8, the main research area is solvation polybenzyl methacrylate lithium glyme based ionic liquid MD; x ray scattering solvation polybenzylmethacrylate lithium glyme ionic liquid.

We report the solvation structure of a lower critical solution temperature (LCST)-type thermoresponsive polymer in a solvate ionic liquid (SIL, i.e., an ionic liquid comprising solvate ions) to elucidate the predominant interaction for the dissolution of the thermoresponsive polymer in SIL at low temperatures The solvation structure of poly(benzyl methacrylate) (PBnMA) and a model compound of its monomer in a typical glyme-based SIL, [Li(G4)][TFSA] (G4: tetraglyme; TFSA: bis(trifluoromethanesulfonyl)amide), have been investigated using high-energy X-ray total scattering and all-atom mol. dynamics simulations. In the model compound/SIL system, the intermol. components extracted from the total G(r)s revealed that the ester moiety of BnMA is preferentially solvated by Li cations through a cation-dipole interaction, which induces slight desolvation of the G4 mols., and the aromatic ring of BnMA is secondarily solvated by the [Li(G4)] cation complex through a cation-π interaction with maintaining the complex structure. In contrast, TFSA anions are attracted only by the [Li(G4)] cation. These interactions result in the formation of a solvation layer of SILs around the aromatic ring, which plays a key role in the neg. entropy and enthalpy of mixing. Meanwhile, in the polymer solution, the coordination number of the Li cation around the ester moiety significantly decreased. This could be ascribed to the steric effect of the bulky side chains, preventing the approach of the [Li(G4)] cation complex to the ester moiety located near the main chain. These solvation structures lead to small absolute values of neg. entropy and enthalpy of mixing, which together are key factors to understand the LCST-type phase behavior in the IL system.

Journal of Physical Chemistry B published new progress about Coordination number. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, HPLC of Formula: 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Hosoya, Takashi published the artcileAlkaline aerobic oxidation of native softwood lignin in the presence of Na+-cyclic polyether complexes, Safety of 2,5,8,11,14-Pentaoxapentadecane, the main research area is softwood lignin sodium cyclic polyether complex aerobic oxidation.

Alk. aerobic oxidation is a promising way to convert lignin to low mol. weight phenols, especially 4-hydroxybenzaldehydes. Our previous studies reported that oxidation of softwood lignin samples with a bulky cation, Bu4N+, facilitates selective production of vanillin (4-hydroxy-3-methoxybenzaldehyde). This study presents vanillin production from native softwood lignin in Japanese cedar (Cryptomeria japonica) in NaOH aqueous in the presence of cyclic polyethers, with our expectation that Na+-polyether complexes exhibit effects similar to those of Bu4N+. Oxidation of wood flour (10 mg) in 4.0 M NaOH aqueous (2.0 mL) at 120°C under air gave vanillin with 6.2 weight% lignin-based yield, which was raised to 15.2 weight% by the addition of 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane). On the other hand, such effect was not observed with the addition of tetraethylene glycol di-Me ether, a non-cyclic analog of 15-crown-5. Mechanistic study with a lignin model compound revealed that stabilization of a vanillin precursor by the complex cation was a reason for the increased vanillin yield exhibited by the crown ether. This is similar to the influence of Bu4N+ reported previously, suggesting effective control of aerobic oxidation by large size cationic species.

Journal of Wood Chemistry and Technology published new progress about Cannizzaro reaction. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Safety of 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Hayashi, Naoto published the artcileElongation of Phenoxide C-O Bonds Due to Formation of Multifold Hydrogen Bonds: Statistical, Experimental, and Theoretical Studies, SDS of cas: 127972-00-3, the main research area is elongation phenoxide carbon oxide bonds due formation multifold hydrogen.

Statistical studies using the Cambridge Structural Database have revealed that there are several elongated phenoxide C-O bonds. They are characterized by the formation of 3-fold (or occasionally 2-fold) hydrogen bonds to the phenoxide oxygen atoms, and their mean bond length extends up to 1.320 Å, which is quite different from the theor. predicted carbon-oxygen bond length of C6H5O- (1.26 Å). Elongated phenoxide C-O bonds associated with the formation of 3-fold hydrogen bonds were also observed in the X-ray structures of proton-transfer complexes (2X-O-)(TEAH+)s derived from 5′-X-substituted 5,5”-dimethyl-1,1′:3′,1”-terphenyl-2,2′,2”-triols (2X-OHs, where X = NO2, CN, COOCH3, Cl, F, H, and CH3) and triethylamine (TEA). By comparing the X-ray structures, C-O bond elongation was found to be only slightly affected by an electron-withdrawing substituent at the para position (X). This along with strong bathochromic shifts of N-H(···O-) and O-H(···O-) stretching vibrations in the IR spectra indicates that the elongated C-O bonds in (2X-O-)(TEAH+)s essentially have single-bond character. This is further confirmed by MO calculations on a model complex, showing that the neg. charged phenoxide oxygen atom is no longer conjugated to the central benzene ring, and the NICS values of the three benzene rings are virtually identical. However, C-O bond elongation in (2X-O-)(TEAH+)s was considerably influenced by a change in the hydrogen-bond geometry. This also suggests that hydrogen bonds significantly affect phenoxide C-O bond elongation.

Journal of Organic Chemistry published new progress about Bathochromic effect. 127972-00-3 belongs to class ethers-buliding-blocks, name is 2-Methoxy-5-methylphenylboronic acid, and the molecular formula is C8H11BO3, SDS of cas: 127972-00-3.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Schaffarczyk McHale, Karin S. published the artcileUnderstanding the effects of solvate ionic liquids as solvents on substitution processes, SDS of cas: 143-24-8, the main research area is solvate ionic liquid solvent nucleophilic substitution reaction kinetics; aromatic substitution reaction kinetics nucleophilic solvent solvate ionic liquid.

The effects of solvate ionic liquids as solvents have been considered for two substitution processes where the solvent effects of typical ionic liquids have been extensively investigated previously; the bimol. nucleophilic substitution (SN2) reaction between pyridine and benzyl bromide and the nucleophilic aromatic substitution (SNAr) reaction between ethanol and 1-fluoro-2,4-dinitrobenzene. It was found that use of solvate ionic liquids gave rise to similar trends in the activation parameters for both substitution processes as typical ionic liquids, implying the microscopic interactions responsible for the effects were the same. However, different effects on the rate constants compared to typical ionic liquids were observed due to the changes in the balance of enthalpic and entropic contributions to the observed rate constants From these data it is clear that the reaction outcome for both of these substitution reactions fall within the ‘predictive framework’ established in previous studies with a cautionary tale or two of their own to add to the general knowledge of ionic liquid solvent effects for these processes, particularly with respect to potential reactivity of the solvate ionic liquids themselves.

Organic & Biomolecular Chemistry published new progress about Activation enthalpy. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, SDS of cas: 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Breno, Kerry L. published the artcileAqueous Phase Organometallic Catalysis Using (MeCp)2Mo(OH)(H2O)+. Intramolecular Attack of Hydroxide on Organic Substrates, Formula: C3H7NO2, the main research area is aqueous phase methylcyclopentadienyl molybdenum hydroxide hydrate catalysis; intramol attack hydroxide organic substrate methylcyclopentadienylmolybdenum hydroxide hydrate catalyzed; ester hydrolysis nitrile hydration oxidation catalyst methylcyclopentadienylmolybdenum hydroxide hydrate; kinetics oxidation ester hydrolysis nitrile hydration methylcyclopentadienylmolybdenum hydroxide catalyzed.

The hydrolysis of esters and difunctional ethers catalyzed by Cp’2Mo(OH)(H2O)+ (1) (Cp’ = η5-C5H4CH3) and the stoichiometric oxidation of CO to CO2 in the presence of 1 are described. These reactions, combined with the previously reported nitrile hydrations and phosphate esters hydrolyzes catalyzed by 1, demonstrate that 1 is an effective homogeneous catalyst for hydration, hydrolysis, and oxidation reactions in aqueous solution under mild conditions (pH ∼ 7, ∼ 80°). Each reaction is proposed to proceed by intramol. attack of the hydroxide ligand on a bound substrate. The intramol. nature of the reaction is supported by the ester hydrolysis activation parameters (ΔH⧧ = 5.9 ± 0.7 kcal/mol and ΔS⧧ = -48 ± 9 eu), the lack of H/D exchange, and the significant increase (106-108) in the rate of hydrolysis over uncatalyzed hydrolysis.

Organometallics published new progress about Activation enthalpy. 16332-06-2 belongs to class ethers-buliding-blocks, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Formula: C3H7NO2.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Kochi, Jay K. published the artcileAlkenes from halides and epoxides by reductive eliminations with chromium(II) complexes, Product Details of C8H9ClO, the main research area is CHROMIUM REDUCTIVE ELIMINATION; COMPLEX; ALKENE FROM ALKYL HALIDE; ALKYL HALIDE ALKENE FROM; REDUCTIVE ELIMINATION HALIDE; EPOXIDE REDUCTIVE ELIMINATION.

A variety of β-substituted alkyl halides and epoxides are reductively eliminated in high yields to alkenes by Cr(II) en at room temperature The reducing agent is easily prepared in situ from chromous salts and ethylenediamine. Reductive elimination and protolytic reduction of β-substituted alkyl halides by chromous reagent proceed by similar mechanisms, and involve free radicals and alkylchromium species as intermediates. In the former process, β-substituents such as OH, OPh, OAc, tosyloxy, Br, Cl, NH2 and trimethylammonium groups are readily eliminated from the β-substituted alkylchromium intermediate to generate alkene. Protolytic reduction of the alkylchromium species is a significant competing reaction only with such β-substituents as CN, benzamido and phthalimido groups. Factors which determine the effect of groups on the relative rates of reductive elimination and protolytic reduction of the alkylchromium species are discussed. The formation of a free radical by an initial ligand transfer of halogen from the alkyl halide to chromous ion is enhanced by β-bromo and trimethylammonium groups. Neighboring group participation by these groups in homolytic processes to form bromine or trimethylammonium-bridged alkyl radicals as intermediates is postulated. Cr(II)en is a more powerful reductant than Cr(II) and the scale of relative reactivity of various halides is compressed in the former relative to the latter. o-Diiodobenzene is reduced by Cr(II)en stepwise to benzene, and benzyne does not appear to be an intermediate in the reaction. 55 references.

Tetrahedron published new progress about Elimination reaction. 622-86-6 belongs to class ethers-buliding-blocks, name is (2-Chloroethoxy)benzene, and the molecular formula is C8H9ClO, Product Details of C8H9ClO.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Drvaric Talian, Sara published the artcileImpedance response of porous carbon cathodes in polysulfide redox system, Formula: C10H22O5, the main research area is impedance porous carbon cathode polysulfide redox.

The transport-reaction mechanism taking place in porous cathodes used in Li-S battery cells is systematically studied using impedance spectroscopy. The adverse effects of metallic Li are excluded by using sym. C-C cells. The results obtained on two types of porous electrodes, a C felt and a conventional mesoporous C electrode, are compared to those previously obtained on a flat glassy C electrode. The thickness of both porous electrodes as well as the thickness of porous separator are varied and impedance spectra studied. The shapes, magnitudes and trends of various impedance features could well be reproduced by a proposed transmission line model. The model is upgraded with respect to known transmission line models in two ways: diffusion in pores of electrode is taken into account and a coupling of this diffusion to diffusion in separator is carried out. The results consistently show that the migration, reaction and diffusion impedances due to processes taking place inside a typical cathode are one to two orders of magnitude smaller than the impedance due to diffusion of active species in the porous separator. However, the present findings strongly indicate that if one could suppress the leakage of polysulfides into the separator, the total impedance would drop dramatically, regardless of the actual thickness or porosity of the cathode.

Electrochimica Acta published new progress about Diffusion (in pores). 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Formula: C10H22O5.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Crespo, Emanuel A. published the artcileIsobaric vapor-liquid equilibrium of water + glymes binary mixtures: Experimental measurements and molecular thermodynamic modelling, Safety of 2,5,8,11,14-Pentaoxapentadecane, the main research area is water ethylene glycol ethyl ether mol thermodn modeling.

In this work, new exptl. data on the isobaric vapor-liquid equilibrium (VLE) of binary aqueous systems, with six different glycol ethers (glymes), some of which are currently used in the Selexol process, were measured at three different pressures, namely 0.05, 0.07, and 0.1 MPa. From the exptl. data, the water activity coefficients were estimated using the modified Raoult’s law and used to infer about the effect of the glymes structure on their interactions with water. Moreover, using a coarse-grain mol. model previously proposed in the framework of the soft-SAFT equation of state (EoS) for both glycols and glymes, the exptl. data were successfully correlated with a single state-independent binary interaction parameter and average absolute deviations from the exptl. data of 1.30 K. Furthermore, the model was used in a predictive manner to obtain the water activity coefficients in the whole composition range, providing useful insights into the systems non-ideality.

Fluid Phase Equilibria published new progress about Correlation analysis. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Safety of 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem