Dimethyl-Ether-Polyethylene-Glycol

Tetrasubstituted phosphonium halides are just as effective as their ammonium counterparts. A combination of tetraphenylphosphonium bromide and either 18-crown-6 or polyethylene glycol dimethyl ether with spray-dried potassium fluoride converts 4-chlorobenzaldehyde to 4-fluorobenzaldehyde in 74% yield [67] In addition, the halogen of a primary alkyl chloride or bromide is easily displaced by fluorine in aqueous saturated potassium fluoride and a catalytic amount of hexadecyltributylphosphonium bromide [68] (Table 7 Procedure 4, p 194)... 

The Selexol process removes acid gases from hydrocarbon gas streams by selective absorption in polyethylene glycol dimethyl ether (DMPEG). It absorbs H2S, C02, COS, and mercaptans. The process has been used to remove carbon dioxide from syngas, natural gas, and coal gas. The process was developed by Allied Chemical in the 1960s and is now... 

Ethers, such as tetrahydrofuran and 1,2-dimethoxyethane, have low dielectric constants (7.4 and 7.2, respectively), and the choice of supporting electrolyte is very limited. The ethers are difficult to reduce and are inert toward many metalorganic reagents [243] that are soluble in the ethers. Ethers are thus suitable as medium for the anodic addition of Grignard reagents to olefins [420]. Dimethoxyethane and polyethylene glycol dimethyl ethers have the ability to solvate electrons [421]. Dissociation constants for some acids and the relative strength of some bases in THE has been determined [422]. 

Rh(acac)(CO)2, TPPSNa, polyethylene glycol dimethyl ether,... 

LOP Lopez, E.R., Coxam, J.-Y., Fernandez, J., and Grolier, J.-P.E., Pressure and temperature dependence of excess enthalpies of methanol + tetraethylene glycol dimethyl ether and methanol + polyethylene glycol dimethyl ether 250, J. Chem. Eng. Data, 44, 1409, 1999. 

Synonyms Dimethoxy polyethylene glycol Glycols, polyethylene, dimethyl ether a,u)-Methoxypoly (ethylene oxide) Polyethylene glycol dimethyl ether Poly (oxy-1,2-ethanediyl), o-methyl-u-methoxy-Formula (C2H40)2C2He0 Toxicology TDLo (oral, male rabbit, 1 day premating) 2500 mg/kg reproductive effector TSCA listed... 

ZA1 Zafarani-Moattar, M.T. and Nasiri, S., Phase diagrams for liquid-liquid and liquid-solid equilibrium of the ternary polyethylene glycol dimethyl ether 2000 + trisodium phosphate + water system at different temperatures and ambient pressure, CALPHAD, 34, 222, 2010. 

Influence of Polyethylene Glycols and Polyethylene Glycol Dimethyl Ethers upon the Internal Dynamics of Water in Oil Microemulsions... 

We determined the percolation temperature of AOT/isooctane/water microemulsions ([AOT] = 0.5 M and W = 22.2) in the presence of different polyethylene glycols and polyethylene glycol dimethyl ethers concentrations. The obtained results are shown in Figures 4.1 and 4.2, respectively. In all cases, we have observed a decrease in the percolation temperature of the system as the polyethylene glycols and polyethylene glycol dimethyl ethers concentration increases. This behavior is significantly different from that observed with crown ethers, where we had observed [48,49] an increase in the percolation temperature of the system as the crown ether concentration increased, until a maximum value was... 

In addition, as Moulik et al. [45] had proposed for the influence of hydrotropes on percolation phenomena, the bridging of water droplets by the polyethylene glycols and polyethylene glycol dimethyl ethers may be also responsible for the decrease in the percolation temperature. The incorporation of polyethylene glycols... 

Tp difference between the percolation temperature in presence and absence of polyethylene glycol dimethyl ethers... 

The aldol-type condensation of aromatic aldehydes with arylacetonitriles is catalysed in a two-phase system by polyethylene glycol dimethyl ethers, " and the Wadsworth-Emmons olefination of an aromatic aldehyde or ketone with an arylmethanephosphoriate and sodium hydride to produce stilbene derivatives has been found to be accelerated in the presence of 15-crown-5. ... 

HER Herraiz, J., Shen, S., Fernandez, J., and Coronas, A., Thermodynamic properties of methanol + some polyethylene glycol dimethyl ether by UNIFAC and DISQUAC group-contribution models for absorption heat pitmps. Fluid Phase Equil., 155, 327, 1999. 

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