Diethyl Ether


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diethyl ether

[dī′eth·əl′ē·thər]
(organic chemistry)
C4H10O A colorless liquid, slightly soluble in water; used as a reagent and solvent. Also known as ethyl ether; ethyl oxide; ethylic ether.

Diethyl Ether

 

(also ether), (C2H5)2O, the most important ether.

Diethyl ether takes the form of a colorless, mobile liquid with a characteristic odor. It has a melting point of – 116.2°C, a boiling point of 34.6°C, and a density of 0.713 g/cm3 at 20°C. Miscible in all proportions with alcohol and many other organic solvents, it is only 6.6-percent soluble in water at 20°C. It readily dissolves fats. Diethyl ether forms an azeotropic mixture with water; the mixture is 98.74-percent diethyl ether, and it has a boiling point of 34.25°C. Diethyl ether is highly flammable, and it forms explosive mixtures with air in concentrations of 1.71–48.0 percent by volume. Upon storage, it is slowly oxidized by atmospheric oxygen to form explosive peroxide compounds.

Diethyl ether is produced from ethyl alcohol at a temperature of 130°–140°C by the action of sulfuric acid—hence, its trivial name in Russian, sernyi efir (sulfuric ether). It may also be produced at 200°–250°C by the vapor-phase dehydration of ethyl alcohol over aluminum oxide (Al2O3) or potassium alums. Diethyl ether is used in industry as a solvent and extracting agent—for example, in the production of powders, motion-picture film, and photographic film. It also has various laboratory uses (seeGRIGNARD REACTION).

In medicine, two grades of diethyl ether are used—medicinal and highly purified. The former is usually applied externally or used for the preparation of tinctures and extracts; it is occasionally taken internally for vomiting. The latter is inhaled as an anesthetic before surgery or sometimes taken as an enema in the form of an oil to reduce pain during childbirth.

The maximum permissible concentration of diethyl ether vapor in the air is 0.3 mg per liter.

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Studying combustion and cyclic irregularity o diethyl ether as supplement fuel in diesel engine, Elsevier fuel xxx doi 10.
2H2O dissolving in ethanol the mixture was refluxed with stirring yielding greenish-blue color precipitate which was filtered and washed with diethyl ether and dried in vacuum for 3 hours (Scheme 3).
The resin was washed with water, methanol, and diethyl ether and then the order of washings was reversed.
Methanol, sodium oxalate, diethyl ether, and hexane were used for sample extraction.
5 g of lipid, dissolved in a mixture of 100 ml of ethanol and diethyl ether (1:1; v/v), with 0.
Initially, the unsaponifiable fraction of raw buriti oil was added to the column and then eluted with a combination of petroleum ether and diethyl ether in concentrations varying from 4 to 20% of diethyl ether.
The product was purified by two reprecipitations from THF into diethyl ether.
250 mg of the oils shown in Table 2, were taken in 1ml hexane respectively and passed on silica gel column (60-120 mesh) and eluted with Petroleum ether, diethyl ether and acetic acid (70:30:1) mixture.
Aspirin ingredients are diverted into heroin production (32,000 tonnes of acetic anhydride were seized in 2007); birthing blood clotters such as ergometrine double as LSD; even the anaesthetic diethyl ether gets diverted into cocaine production.
The diethyl ether fraction from crude ethanolic extract which exhibited stronger activity was submitted to fractionation by gradient elution with hexane/ethyl acetate.