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Advanced Organic Chemistry: Infrared spectrum of 2-methylpropanal

Interpreting the infrared spectrum of 2-methylpropanal (isobutyraldehyde)

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-methylpropanal

infrared spectrum of 2-methylpropanal C4H8O (CH3)2CHCHO wavenumbers cm-1 functional group detection fingerprint pattern identification of isobutyraldehyde doc brown's advanced organic chemistry revision notes 

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

2-methylpropanal   C4H8O   aldehydes and ketones nomenclature (c) doc b    aldehydes and ketones nomenclature (c) doc b    aldehydes and ketones nomenclature (c) doc b

Interpretation of the infrared spectrum of 2-methylpropanal

The most prominent infrared absorption lines of 2-methylpropanal

The stretching vibrations of the C-H bond of the alkyl grouping occur at 2975 to 2845 cm-1.

The stretching vibrations of the C-H bond of the aldehyde group (CHO) occur at 2880 to 2650 cm-1.

There is a very prominent C=O stretching vibration absorption at 1740 to 1720 cm-1, characteristic of all molecules with a carbonyl group.

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


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