|Jmol-3D images||Image 1|
|Molar mass||74.12 g mol−1|
|Density||0.7134 g/cm3, liquid|
|Melting point||−116.3 °C, 156.9 K, −177.3 °F|
|Boiling point||34.6 °C, 307.8 K, 94.3 °F|
|Solubility in water||69 g/L (20 °C)|
|Refractive index (nD)||1.353 (20 °C)|
|Viscosity||0.224 cP (25 °C)|
|Dipole moment||1.15 D (gas)|
|R-phrases||R12 R19 R20/22 R66 R67|
|S-phrases||S9 S16 S29 S33|
|Main hazards||Extremely Flammable, harmful to skin|
|Flash point||−45 °C|
|Autoignition temperature||160 °C|
|Explosive limits||1.9-48.0% |
|Related Ethers||Dimethyl ether
|Related compounds||Diethyl sulfide
|Supplementary data page|
|n, εr, etc.|
Solid, liquid, gas
|Spectral data||UV, IR, NMR, MS|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
Diethyl ether, also known as ethyl ether, sulfuric ether, simply ether, or ethoxyethane, is an organic compound in the ether class with the formula (C
2O. It is a colorless, highly volatile flammable liquid. It is commonly used as a solvent and was once used as a general anesthetic. It has narcotic properties and has been known to cause temporary psychological addiction, sometimes referred to as etheromania.
The compound may have been created by either Jābir ibn Hayyān in the 8th century or Raymundus Lullus in 1275, although there is no contemporary evidence of this. It was first synthesized in 1540 by Valerius Cordus, who called it "sweet oil of vitriol" (oleum dulce vitrioli) — the name reflects the fact that it is obtained by distilling a mixture of ethanol and sulfuric acid (then known as oil of vitriol) — and noted some of its medicinal properties. At about the same time, Paracelsus discovered ether's analgesic properties in chickens. The name ether was given to the substance in 1729 by August Sigmund Frobenius.
As a fuel
Diethyl ether has a high cetane number of 85-96 and is used as a starting fluid, in combination with petroleum distillates for gasoline and diesel engines because of its high volatility and low flash point. For the same reason it is also used as a component of the fuel mixture for carbureted compression ignition model engines.
Diethyl ether is a common laboratory solvent. It has limited solubility in water (6.05 g/100 mL at 25 °C.)  and dissolves 1.5 g/100 mL water at 25 °C. Therefore, it is commonly used for liquid-liquid extraction. When used with an aqueous solution, the organic layer is on top as the diethyl ether has a lower density than the water. It is also a common solvent for the Grignard reaction in addition to other reactions involving organometallic reagents. Due to its application in the manufacturing of illicit substances, it is listed in the Table II precursor under the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances.
William T.G. Morton participated in a public demonstration of ether anesthesia on October 16, 1846 at the Ether Dome in Boston, Massachusetts. However, Crawford Williamson Long, M.D., is now known to have demonstrated its use privately as a general anesthetic in surgery to officials in Georgia, as early as March 30, 1842, and Long publicly demonstrated ether's use as a surgical anesthetic on numerous occasions before 1846. British doctors were aware of the anesthetic properties of ether as early as 1840 where it was widely prescribed in conjunction with opium. Diethyl ether was formerly sometimes used in place of chloroform because it had a higher therapeutic index, a larger difference between the recommended dosage and a toxic overdose. Because of its associations with Boston, the use of ether became known as the "Yankee Dodge."
Today, ether is rarely used. The use of flammable ether was displaced by nonflammable fluorinated hydrocarbon anesthetics. Halothane was the first such anesthetic developed and other currently used inhaled anesthetics, such as isoflurane, desflurane, and sevoflurane, are also fluorinated hydrocarbons. Diethyl ether was found to have undesirable side effects, such as post-anesthetic nausea and vomiting. Modern anesthetic agents reduce these side effects.
The anesthetic effects of ether have made it a recreational drug. Diethyl ether in anesthetic dosage is an inhalant which has a long history of recreational use. Disadvantages are the high flammability, especially in conjunction with oxygen, and the long duration of action after discontinuing its administration. One advantage is a well-defined margin between therapeutic and toxic doses, which means one would pass out before dangerous levels of dissolved ether in blood would be reached. With a strong, dense smell, ether causes irritation to respiratory mucosa and is uncomfortable to breathe, often triggering salivation, vomiting, coughing or spasms. In concentrations of 3-5% in air, an anesthetic effect can slowly be achieved in 15–20 minutes of breathing approximately 15-20ml of ether, depending on body weight and physical condition. Ether causes a very long excitation stage prior to blacking out.
In the 19th century and early 20th century ether drinking was popular among Polish peasants. It is a traditional and still relatively popular recreational drug among Lemkos. It is usually consumed in a small quantity (kropka, or "dot") poured over milk, water with sugar or orange juice in a shot glass. Drinking any amount of ether may attack the stomach lining and cause unpredictable physical effects.
Diethyl ether inhibits alcohol dehydrogenase, and thus slows the metabolism of ethanol . It also inhibits metabolism of other drugs requiring oxidative metabolism. For example diazepam requires hepatic oxidization whereas its oxidized metabolite oxazepam does not.
Most diethyl ether is produced as a byproduct of the vapor-phase hydration of ethylene to make ethanol. This process uses solid-supported phosphoric acid catalysts and can be adjusted to make more ether if the need arises. Vapor-phase dehydration of ethanol over some alumina catalysts can give diethyl ether yields of up to 95%.
Diethyl ether can be prepared both in laboratories and on an industrial scale by the acid ether synthesis. Ethanol is mixed with a strong acid, typically sulfuric acid, H2SO4. The acid dissociates in the aqueous environment producing hydronium ions, H3O+. A hydrogen ion protonates the electronegative oxygen atom of the ethanol, giving the ethanol molecule a positive charge:
- CH3CH2OH + H3O+ → CH3CH2OH2+ + H2O
- CH3CH2OH2+ + CH3CH2OH → H2O + H+ + CH3CH2OCH2CH3
This reaction must be carried out at temperatures lower than 150 °C in order to ensure that an elimination product (ethylene) is not a product of the reaction. At higher temperatures, ethanol will dehydrate to form ethylene. The reaction to make diethyl ether is reversible, so eventually an equilibrium between reactants and products is achieved. Getting a good yield of ether requires that ether be distilled out of the reaction mixture before it reverts to ethanol, taking advantage of Le Chatelier's principle.
Another reaction that can be used for the preparation of ethers is the Williamson ether synthesis, in which an alkoxide (produced by dissolving an alkali metal in the alcohol to be used) performs a nucleophilic substitution upon an alkyl halide.
Safety and Stability
Diethyl ether is extremely flammable and may be explosive.
Since ether is heavier than air it can collect low to the ground and the vapour may travel considerable distances to ignition sources, which need not be an open flame, but may be a hot plate, steam pipe, heater etc. Vapour may be ignited by the static electricity which can build up when ether is being poured from one vessel into another. The autoignition temperature of diethyl ether is 160 °C (320 °F). A common practice in chemical labs is to use steam (thus limiting the temperature to 100 °C (212 °F) ) when ether must be heated or distilled. The diffusion of diethyl ether in air is 0.918·10−5 m2/s (298K, 101.325 kPa).
Ether is stable, but sensitive to light and air, tending to form explosive peroxides. Ether peroxides are higher boiling than ether and are contact explosives when dry. Commercial diethyl ether is typically supplied with trace amounts of the antioxidant butylated hydroxytoluene (BHT), which reduces the formation of peroxides. Storage over sodium hydroxide precipitates the intermediate ether hydroperoxides. Water and peroxides can be removed by either distillation from sodium and benzophenone, or by passing through a column of activated alumina.
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|url=missing title (help).
- Ether and its effects in Anesthesia.
- Morgan, G. Edward, Jr. et al. "Clinical Anesthesiology" 3rd Ed, p. 3. New York: Mc Graw-Hill. 2002
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- Kaszycki, Nestor (2006-08-30). "Łemkowska Watra w Żdyni 2006 – pilnowanie ognia pamięci". Histmag.org – historia od podszewki (in Polish). Kraków, Poland: i-Press. Retrieved 2009-11-25. "Dawniej eteru używało się w lecznictwie do narkozy, ponieważ ma właściwości halucynogenne, a już kilka kropel inhalacji wystarczyło do silnego znieczulenia pacjenta. Jednak eter, jak każda ciecz, może teoretycznie być napojem. Łemkowie tę teorię praktykują. Mimo to, nazywanie skroplonego eteru – „kropki” – ich „napojem narodowym” byłoby przesadą. Chociaż stanowi to pewną część mitu „bycia Łemkiem”."
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|Wikimedia Commons has media related to Diethyl ether.|
- Michael Faraday's announcement of ether as an anesthetic in 1818
- Calculation of vapor pressure, liquid density, dynamic liquid viscosity, surface tension of diethyl ether, ddbonline.ddbst.de
- CDC - NIOSH Pocket Guide to Chemical Hazards