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Advanced Organic Chemistry: Infrared spectrum of 2-methylbut-1-ene

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Interpreting the infrared spectrum of 2-methylbut-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-methylbut-1-ene

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Infrared spectroscopy - spectra index

infrared spectrum of 2-methylbut-1-ene wavenumbers cm-1 functional group detection fingerprint pattern identification of 2-methylbut-1-ene 2-methyl-1-butene doc brown's advanced organic chemistry revision notes 

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

2-methylbut-1-ene C5H10, alkenes structure and naming (c) doc b , alkenes structure and naming (c) doc b

Interpretation of the infrared spectrum of 2-methylbut-1-ene

The most prominent infrared absorption lines of 2-methylbut-1-ene

The most characteristic absorption is ~1660 cm-1 due to the C=C vibration (stretching).

You don't find this C=C absorption band in the infrared spectra of saturated alkanes.

There are also characteristic lines due to various C-H vibration absorptions group at wavenumbers ~3100, ~2900, ~1290-1420 and ~900 cm-1.

The absence of other specific functional group bands will show that particular functional group is absent from the 2-methylbut-1-ene molecular structure.


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