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Advanced Organic Chemistry: Infrared spectrum of 2-methylpropene

Interpreting the infrared spectrum of 2-methylpropene (2-methylprop-1-ene)

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 2-methylpropene

infrared spectrum of 2-methylpropene C4H8 (CH3)2C=CH2 wavenumbers cm-1 functional group detection fingerprint pattern identification of 2-methylprop-1-ene doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of 2-methylpropene. The right-hand part of the of the infrared spectrum of 2-methylpropene, wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of 2-methylpropene and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of 2-methylpropene.

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Interpretation of the infrared spectrum of 2-methylpropene

The most prominent infrared absorption lines of 2-methylpropene

There are prominent bands of C-H stretching/deformation vibration absorptions peaking at wavenumbers ~3095 to 3075 cm-1, and also at wavenumbers 895 to 885 cm-1, associated with the C-H bonds in a R1R2C=CH2 grouping e.g. as in 2-methylpropene.

Overlapping with the above, are prominent bands due to C-H stretching vibration absorptions peak at wavenumbers ~2975 to 2860 cm-1, typical of molecules with a methyl alkyl group.

There is a characteristic absorption for C=C stretching vibrations, peaking at wavenumbers 1680 to 1620 cm-1, typical of an alkene like 2-methylpropene.

The absence of other specific functional group bands will show that a particular functional group is absent from the 2-methylpropene molecular structure.


Key words & phrases: isomer of molecular formula C4H8 (CH3)2C=CH2 image and diagram explaining the infrared spectrum of 2-methylpropene, complete infrared absorption spectrum of 2-methylpropene, comparative spectra of 2-methylpropene, prominent peaks/troughs for identifying functional groups in the infrared spectrum of 2-methylpropene, important wavenumber values in cm-1 for peaks/troughs in the infrared spectrum of 2-methylpropene, revision of infrared spectroscopy of 2-methylpropene, fingerprint region analysis of 2-methylpropene, how to identify 2-methylpropene from its infrared spectrum, identifying organic compounds like 2-methylpropene from their infrared spectrum, how to analyse the absorption bands in the infrared spectrum of 2-methylpropene detection of alkene functional groups in the 2-methylpropene molecule example of the infrared spectrum of a molecule like 2-methylpropene with a alkene functional group  interpreting interpretation of the infrared spectrum of 2-methylpropene shows presence of alkene functional group 2-methylpropene 2-Methylprop-1-ene methylpropene isobutene isobutylene 2-methylpropylene


Links associated with 2-methylpropene

The chemistry of ALKENES revision notes INDEX

The mass spectrum of 2-methylpropene (2-methylprop-1-ene)

The H-1 NMR spectrum of 2-methylpropene (2-methylprop-1-ene)

The C-13 NMR spectrum of 2-methylpropene (2-methylprop-1-ene)

Infrared spectroscopy index

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