Tetra dimethyl ether

Chaput, Jeminet and Juillard measured the association constants of several simple polyethylene glycols with Na", K", Cs", and Tl". Phase transfer catalytic processes and most biological processes are more likely to involve the first two cations rather than the latter two, so we will confine the discussion to these. Stability constants for the dimethyl ethers of tetra-, penta-, hexa-, and heptaethylene glycols were determined poten-tiometrically in anhydrous methanol solution and are shown in Table 7.1. In the third column of the table, the ratio of binding constants (Ks/K s) is calculated. Note that Simon and his coworkers have referred to this ratio as the selectivity constant. ... 

DME ethylene glycol dimethyl ether TBAI tetra-n-butylammonium iodide... 

SOLINOX SO,. Linde NO,] A process for removing both NOx and SOx from fluegases. The SOx is removed by scrubbing with tetra-ethylene glycol dimethyl ether, circulated in a packed tower (the Selexol process). The NOx is destroyed by Selective Catalytic Reduction ( SCR). The sorbent is regenerated with steam the SOx is recovered for conversion to sulfuric acid. Developed by Linde in 1985 and used in a lead smelter in Austria and several power stations in Germany. In 1990 it was announced that it would be used at the titanium pigment plant in The Netherlands operated by Sachtleben. 

Electrolytic reduction, apparatus, 52, 23 Enol acetates, acylation of, 52,1 Enol esters, preparation, 52, 39 Epichlorohydrin, with boron trifluoride diethyl therate and dimethyl ether to give trimethyloxonium tetra-fluoroborate, 51,142 ESTERIFICATION OF HINDERED ALCOHOLS f-BUTYL p-TOLUATE,... 

Alkali metal hexafluoroantimonates arc used, like hexafluorophosphate or tetrafluoroborate salts, to effect halogen-exchange fluorination in organosilanes both in the presence and in the absence of solvents. Fluorotriphenylsilane and difluorodiphenylsilane are obtained in 87 and 95 % yield by heating the corresponding chlorides with sodium hexafluoroantimonate in tetra-ethylene glycol dimethyl ether (tetraglyme).102 Tetrafluoroborates react with chlorosilanes faster than hexafluorophosphate or hexafluoroantimonate salts. 

List B, giving examples of liquids where a degree of concentration is necessary before hazardous levels of peroxides will develop, includes several common solvents containing one ether function (diethyl ether, ethyl vinyl ether, tetrahydrofuran), or two ether functions (p-dioxane, 1,1 -diethoxyethane, the dimethyl ethers of ethylene glycol or diethylene glycol ), the secondary alcohols 2-propanol and 2-butanol, as well as the susceptible hydrocarbons propyne, butadiyne, dicyclopentadiene, cyclohexene and tetra- and deca-hydronaphthalenes. Checking stocks at 12 monthly intervals, with peroxidic samples being discarded or repurified, is recommended here [1],... 

Chromatographic System (See Chromatography, Appendix IIA.) Use a gas chromatograph equipped with a thermal-conductivity detector and containing a 6-m x 3-mm aluminum column, or equivalent, packed with 10 weight percent tetra-ethylene glycol dimethyl ether liquid phase on a support of crushed firebrick (GasChrom R, or equivalent), which has been calcined or burned with a clay binder above 900° and silanized, or equivalent. Use helium as the carrier gas at a flow rate of 50 mL/min, and maintain the temperature of the column at 33°. 

TEGDME Tetra ethylene glycol dimethyl ether... 

Pentaoxapentadecane Tetra-ethylene glycol dimethyl ether. A trademark for tetraethylene glyc dimethyl ether (tetraglyme). a solvent. Liquid bp = 275.3° d = 1.0114 soluble in EtOH, Et20, CCI4. freely soluble in H2O. 

Subsequently, glaucine was subjected to Hofmann degradation (14), and the methiodide (m.p. 222°) as well as the tetramethoxyvinylphenan-threne (m.p. 142°) were shown to be identical with the same derivatives prepared from boldine dimethyl ether (15). The corresponding tetra-methoxyphenanthrene-8-carboxylic acid melts at 213° (15). 

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