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Advanced Organic Chemistry: Infrared spectrum of 2-methoxypropane

Interpreting the infrared spectrum of 2-methoxypropane

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-methoxypropane

infrared spectrum of 2-methoxypropane C4H10O CH3CH(OCH3)CH3 wavenumbers cm-1 functional group detection fingerprint pattern identification of methyl isopropyl ether doc brown's advanced organic chemistry revision notes 

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

2-methoxypropane    C4H10    alcohols and ether structure and naming (c) doc b    alcohols and ether structure and naming (c) doc b    alcohols and ether structure and naming (c) doc b

Interpretation of the infrared spectrum of 2-methoxypropane

Expected prominent infrared absorption lines of 2-methoxypropane

A group of C-O stretching absorptions, from the ether linkage (C-O-C) are found around wavenumbers 1150 to 1060 cm-1.

You get C-H bending/deformation vibration absorption bands at wavenumbers 1470 to 1365 cm-1.

The C-H stretching vibration absorption bands are found in the 2800 to 3000 cm-1  wavenumber region.

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

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