Advanced Organic Chemistry: Infrared spectrum of ethoxyethane CH3CH2OCH2CH3

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Interpreting the infrared spectrum of ethoxyethane (diethyl ether)

[Author © Dr Phil Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 and AP honors chemistry courses: Molecular spectroscopy analysis of ethoxyethane [spectra page updated Mar 23rd 2026 *]

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Introductory note on the infrared spectrum of ethoxyethane

Students and teachers please note my explanation of the infrared spectrum of ethoxyethane is designed for advanced, but pre-university, chemistry courses.

Based in the infrared spectrum diagram for ethoxyethane, only some of the most prominent peaks for particular bond vibrations are discussed, particularly if ethoxyethane has a functional group with a particular characteristic wavenumber peak.

The infrared spectrum of ethoxyethane is unique and the whole, or selected wavenumbers, can be used to fingerprint its identity, sometimes analysing a mixture containing ethoxyethane or following its change of concentration in a reaction.

infrared spectrum of ethoxyethane wavenumbers cm-1 functional group detection fingerprint pattern identification of  diethyl ether doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of ethoxyethane. The right-hand part of the of the infrared spectrum of ethoxyethane, wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of ethoxyethane and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of ethoxyethane.

Ethoxyethane C4H10O, alcohols and ether structure and naming (c) doc b , alcohols and ether structure and naming (c) doc b , alcohols and ether structure and naming (c) doc b aliphatic ether

The molecular structure and naming of aliphatic alcohols and ethers

Interpretation of the infrared spectrum of ethoxyethane (diethyl ether)

The most prominent infrared absorption lines of ethoxyethane

A group of C-O stretching absorptions, from the ether linkage (C-O-C) are found around wavenumbers 1150 to 1060 cm-1.

The C-H stretching vibration absorption bands are found in the 2800 to 3000 cm-1  wavenumber region.

The absence of other specific functional group bands will show that particular functional group is absent from the ethoxyethane molecular structure.

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Associated links

The mass spectrum of ethoxyethane (diethyl ether)

The H-1 NMR spectrum of Ethoxyethane (diethyl ether)

The C-13 NMR spectrum of ethoxyethane

Infrared spectroscopy index

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