Di alkyl ethers

Di-alkyl ethers of ethylene glycol, ROCHjCHjOR. The dimethyl ether, b.p. 85°/760 mm., is miscible with water, is a good solvent for organic compounds, and is an excellent inert reaction medium. The diethyl ether (diethyl cdloaolve), b.p. 121-57760 mm., is partially miscible with water (21 per cent, at 20°). 

Di- -alkyl ethers The effective conformation of diethyl ether (in CT, 25°) has the terminal C—Me bonds rotated ca. 24° from a flat zig-zag structure so that they are trans with respect to the C—0—C plane. A non-planar conformation for di-n-propyl ether, compatible with the observed oo(, 2), can be specified with higher ethers the possibilities of internal rotations make this difficult Aroney et al., 1962c... 

Paraffin Acid Alcohol Formate ester Di-alkyl-ether Ether aldehyde... 

In 1950, Fox and Zisman [8] reported their study of the wettability of poly(tetrafluoroethylene) (PTFE) with n-alkanes, di( -alkyl)ethers, n-alkylbenzenes, and many other liquids. A linear relationship between the cosine of the contact angle (cos0) and the surface tension of the liquid (7lv) for the n-alkane solvents was obtained (Fig. 7.2). Similar plots were also obtained for di(n-alkyl)ethers and... 

Ethers are compounds of the general formula Ar—O—Ar, Ar—O—R, and R—O—where Ar is an aryl group and R is an alkyl group. If the two R or Ar groups are identical, the compound is a symmetrical ether. Examples of symmetrical ethers are (di)methyl ether, CH OCH, and (di)phenyl ether,... 

Montmorillonites containing interlamellar water associated with cations (Cu2+, Fe3+, Al3+) react under mild conditions with terminal alkenes to give the corresponding di-sec-alkyl ethers.26 The alkene-water reaction is a stoichiometric process, while the reaction of the second molecule of alkene with the intermediate 2-alkanol is catalytic. 

Mono- and di-alkylated furans were synthesized in a one-pot preparation from 2-propynyl-2-tetrahydropyranyl ether (106), butyllithium and formaldehyde. The intermediate allenyl ether (107) presumably cyclizes via a 2-(2-tetrapyranyloxy)-2,5-dihydrofuran (108) to afford the heterocycle (109) (79AG(E)875). In a similar manner, singly and doubly branched tetrahydropyranyloxybutynolates afforded the substituted furans (110) (Scheme 20). The thermocatalytic isomerization of ethyl l-methyl-2-phenylcyclopropene-3-carboxylate yielded the furan, possibly by a 1,3-sigmatropic displacement step or by a non-concerted biradical intermediate (75T2495). 

Vm (branched di-n-alkyl ether) > Vm (unbranched dialkyl ether) (R-3.2.2)... 

Skubla [9] has designed a group contribution scheme which applies for various homologous series. His method relies on eq. 6.2.1 where both coefficients a0 and a have to be derived from group contributions and with respect to Nc. The model applies for n-alkanes, 1-alkenes, n-alkylcyclopentanes and n-alkylcyclohexanes, alkylbenzenes, 1-bromoalkanes, 1-alkanols, di-n-alkyl ethers, carboxylic acids and esters, 1-alkanethiols, 1-aminoalkanes, dialkylamines, alkaneamides, and some... 

Attempts to achieve favored monoalkylation have always resulted in mixtures of starting material and mono- and di-alkylation products. The situation is further complicated in the case of isosorbide as the substrate two different mono-ethers are formed, corresponding to the 2(exo) and 5(endo) positions. Thus, in contrast to a regioselective monoacylation,104 a similar monoalkylation of isosorbide has not as yet been observed. 

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