Diethyl ether peroxide


Diethyl ether peroxide
Diethyl ether hydroperoxide
Identifiers
CAS number 18321-53-4
ChemSpider 19985446 YesY
Jmol-3D images Image 1
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Properties
Molecular formula C4H10O3
Molar mass 106.12 g/mol
Density 1.005 g/cm³
Boiling point

62 - 64 °C at 18.7 hPa (reduced pressure)

Hazards
Main hazards Explosive
NFPA 704
NFPA 704.svg
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 YesY ether peroxide (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Diethyl ether peroxides are a class of organic peroxides that slowly form in diethyl ether upon storage under air, light, or in the presence of metal by autoxidation.

Contents

Diethyl ether hydroperoxide

Diethyl ether hydroperoxide (CH3-CH2-O-CH(OOH)-CH3) is a colorless liquid of low viscosity with a pleasant smell. Upon heating it weakly deflagrates, resulting in a fog of acetic acid and water. Diethyl ether hydroperoxide decomposes in the presence of sodium hydroxide and Fe2+-containing salts.

Diethyl ether peroxide

Diethyl ether peroxide, also known as ethylidene peroxide, (-CH(CH3)OO-)n is a polymerization product of diethyl ether hydroperoxide. It is a colorless oily liquid that is an extremely brisant and friction sensitive explosive material. Amounts of less than 5 milligrams can damage chemical apparatuses.[who?] The dangerous properties of ether peroxides are the reason that diethyl ether and other peroxide forming ethers like tetrahydrofuran (THF) or ethylene glycol dimethyl ether (1,2-dimethoxyethane) are avoided in industrial processes.

Formation of diethyl ether peroxide

Tests

Diethyl ether peroxides can be detected with potassium iodide (KI) solution or potassium iodide / starch paper. A positive test results in the formation of iodine (I2) that causes a pink color of the ether phase or a dark bluish spot on the paper strip.

Degradation

Ether peroxides can be destroyed by disproportionation to acetaldehyde with Fe2+ or Mn2+ ions or with triphenylphosphine (PPh3). The resulting aldehyde has to be removed to prevent a rapid back-formation of peroxides.

References

  • A. Rieche, R. Meister, Modellversuche zur Autoxidation der Äther, Angewandte Chemie 49(5):106 (1936) (German)

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