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Advanced Organic Chemistry: Infrared spectrum of 1,3-dioxane

Interpreting the infrared spectrum of 1,3-dioxane

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 1,3-dioxane

infrared spectrum of 1,3-dioxane C4H8O2 wavenumbers cm-1 functional group detection fingerprint pattern identification of 1,3-dioxane doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of 1,3-dioxane. The right-hand part of the of the infrared spectrum of 1,3-dioxane, wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of 1,3-dioxane and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of 1,3-dioxane.

Interpretation of the infrared spectrum of 1,3-dioxane

The most prominent infrared absorption lines of 1,3-dioxane

There are no particular characteristic lines, just the usual C-H stretching and bending and deformation vibrations you observe with any organic molecule with alkyl groups e.g. ~3000 to 2800 and 1480 to 1365 cm-1.

You get C-O stretching vibrations for cyclic ethers at wavenumbers ~940 and 1140 to 1070 cm-1.

The absence of other specific functional group bands will show that a particular functional group is absent from the 1,3-dioxane molecular structure.


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