Advanced Organic Chemistry: Infrared spectrum of cyclobutane

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Interpreting the infrared spectrum of cyclobutane

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of cyclobutane

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Infrared spectroscopy - spectra index

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

Interpretation of the infrared spectrum of cyclobutane

The most prominent infrared absorption lines of gaseous cyclobutane

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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Links associated with cyclobutane

The chemistry of ALKANES revision notes INDEX

The mass spectrum of cyclobutane

The H-1 NMR spectrum of cyclobutane

The C-13 NMR spectrum of cyclobutane

Infrared spectroscopy index


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