Advanced Organic Chemistry: Carbon-13 NMR spectrum 1,3-dimethylbenzene

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The Carbon-13 NMR spectrum of 1,3-dimethylbenzene (m-xylene)

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 1,3-dimethylbenzene

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C-13 NMR spectroscopy - spectra index

C8H10 C-13 nmr spectrum of 1,3-dimethylbenzene analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of m-xylene C13 13C nmr 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 shifts, called chemical shifts, depend on the individual (electronic) chemical environment of the 13C atoms in an organic molecule - 1,3-dimethylbenzene here.

1,3-dimethylbenzene, C8H10, (c) doc b , (c) doc b

Interpreting the C-13 NMR spectrum of 1,3-dimethylbenzene

As you can see from the diagram above there are 5 different chemical shift lines in the C-13 NMR spectrum of 1,3-dimethylbenzene indicating 5 different chemical environments of the carbon atoms.

On the C-13 NMR spectrum diagram for 1,3-dimethylbenzene you can see chemical shifts (a) to (d) are for the benzene ring carbon atoms and one chemical shift (e) for the side-chain carbon atom of the methyl groups.

The carbon-13 NMR spectra a provides direct evidence of 5 different carbon atom environments in the 1,3-dimethylbenzene molecule from 5 different 13C chemical shifts (ppm).

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