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Advanced Organic Chemistry: Carbon-13 NMR spectrum of methanol

The Carbon-13 NMR spectrum of methanol

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 C-13 NMR spectra of methanol

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 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 alcohols and ether structure and naming (c) doc b

Interpreting the C-13 NMR spectrum of methanol

As you can see from the diagram above there is only chemical shift line in the C-13 NMR spectrum of methanol indicating 1 different chemical environments 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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