CH3OH C-13 nmr spectrum of methanol analysis of chemical shifts ppm interpretation of 13C chemical shifts ppm of methanol C13 13-C nmr methyl alcohol spin-spin coupling for line splitting doc brown's advanced organic chemistry revision notes

Advanced Organic Chemistry: Carbon-13 NMR spectrum of methanol CH₃OH

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Interpreting the Carbon-13 NMR spectrum of methanol CH₃OH

[Author © Dr Phil Brown PhD: Doc Brown's advanced level organic chemistry exam revision notes suitable for students of UK A level chemistry courses & US K12 grade 11, grade 12 and AP honors chemistry courses: Molecular spectroscopy analysis of methanol [spectra page updated Mar 24th 2026 *]

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C-13 NMR spectroscopy - spectra index

Introductory note on the 13C NMR spectrum of methanol

Students and teachers please note that my explanation of the carbon-13 NMR spectrum of methanol is designed for advanced, but pre-university, chemistry courses.

The description does not involve the chemical shift δ spin-spin coupling effects for methanol and the relative size of the carbon-13 NMR shifts does not give the ratio of the carbon atoms in the different non-equivalent chemical environments of the methanol molecule.

The most common solvent used for investigating the C13 NMR spectrum of compounds like methanol, is CDCl₃ and other deuterated solvents.

CH3OH C-13 nmr spectrum of methanol analysis of chemical shifts ppm interpretation of 13C chemical shifts ppm of methanol C13 13-C nmr methyl alcohol spin-spin coupling for line splitting doc brown's advanced organic chemistry revision notes

TMS is the acronym for tetramethylsilane, formula Si(CH₃)₄, whose ¹³C atoms are arbitrarily given a chemical shift of 0.0 ppm. This is the 'standard' in ¹³C NMR spectroscopy and all other ¹³C resonances, called chemical shifts, are measured with respect to the TMS, and depend on the individual (electronic) chemical environment of the ¹³C atoms in an organic molecule - methanol here.

Methanol CH₄O

The molecular structure and naming of aliphatic alcohols and ethers

Interpreting the C-13 NMR spectrum of methanol

As you can see from the diagram above there is only one chemical shift line in the C-13 NMR spectrum of methanol indicating one ¹³C chemical environment of the carbon atom.

CH₃OH

Note the effect on the 13C chemical shift of the oxygen atom in the methanol molecule - electronegative atoms tend to increase the chemical shift compared to less electronegative carbon atoms.

The carbon-13 NMR spectra a provides direct evidence of only one chemical environment of the carbon atom in methanol - hardly unexpected!

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