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Advanced Organic Chemistry: Infrared spectrum of 1-methylethyl methanoate

Interpreting the infrared spectrum of 1-methylethyl methanoate

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 1-methylethyl methanoate

infrared spectrum of 1-methylethyl methanoate C4H8O2 HCOOCH(CH3)2 wavenumbers cm-1 functional group detection fingerprint pattern identification of isopropyl formate doc brown's advanced organic chemistry revision notes 

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

HCOOCH(CH3)2  1-methylethyl methanoate, propan-2-yl methanoate,

is an example of an ester, some old names: isopropyl methanoate, isopropyl formate

Interpretation of the infrared spectrum of 1-methylethyl methanoate

The most prominent infrared absorption lines of 1-methylethyl methanoate

C-H stretching vibration absorptions occur in the wavenumber region 2975 to 2860 cm-1.

Not very important, common to most organic molecules.

For saturated aliphatic esters, the characteristic C=O stretching vibration absorptions occur in the wavenumber region 1750 to 1735 cm-1.

This is a very characteristic absorption for any molecule e.g. an ester like 1-methylethyl methanoate, with a C=O carbonyl group, but other types of compounds too.

For methanoate esters, C-O stretching vibration absorptions occur in the wavenumber region 1200 to 1180 cm-1.

The absence of other specific functional group bands will show that a particular functional group is absent from the 1-methylethyl methanoate molecular structure e.g. no hydroxyl group vibration at ~3500 to 3200 cm-1, obviously not expected for an ester like 1-methylethyl methanoate, but expected for a carboxylic acid like the isomeric butanoic acid.

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


Key words & phrases: C4H8O2 HCOOCH(CH3)2 image and diagram explaining the infrared spectrum of 1-methylethyl methanoate, complete infrared absorption spectrum of 1-methylethyl methanoate, comparative spectra of 1-methylethyl methanoate, prominent peaks/troughs for identifying functional groups in the infrared spectrum of 1-methylethyl methanoate, important wavenumber values in cm-1 for peaks/troughs in the infrared spectrum of 1-methylethyl methanoate, revision of infrared spectroscopy of 1-methylethyl methanoate, fingerprint region analysis of 1-methylethyl methanoate, how to identify 1-methylethyl methanoate from its infrared spectrum, identifying organic compounds like 1-methylethyl methanoate from their infrared spectrum, how to analyse the absorption bands in the infrared spectrum of 1-methylethyl methanoate detection of ester functional groups in the 1-methylethyl methanoate molecule example of the infrared spectrum of a molecule like 1-methylethyl methanoate with a ester functional group  interpreting interpretation of the infrared spectrum of 1-methylethyl methanoate shows presence of ester functional group propan-2-yl methanoate isopropyl methanoate, isopropyl formate


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