Advanced Organic Chemistry: Infrared spectrum of cyclobutane

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Interpreting and explaining the infrared spectrum of cyclobutane cyclo-C4H8

[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 cyclobutane [spectra page updated Mar 22nd 2026 *]

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Introductory note on the infrared spectrum of cyclobutane

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

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

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

infrared spectrum of cyclobutane C4H8 wavenumbers cm-1 functional group detection fingerprint pattern identification of cyclobutane doc brown's advanced organic chemistry revision notes 

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

Cyclobutane, C4H8 , alkanes structure and naming (c) doc b, alkanes structure and naming (c) doc b skeletal formula for cyclobutane molecular structure molecular formula C4H8 it is not planar, it is bent

The molecular structure and naming of alkanes

Interpretation of the infrared spectrum of cyclobutane

The most prominent infrared absorption lines of gaseous cyclobutane are

CH2 stretching vibration absorptions, peaking at wavenumbers ~2987 and 2887 cm-1.

Various CH2 vibration absorption modes peaking at wavenumbers ~627, 749, 1223, 1257, 1447, 2952 cm-1.

C4 ring deformation vibration absorptions peaking at wavenumber ~898 cm-1.

(data from NIST website)

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


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