C8H10 C-13 nmr spectrum of 1,2-dimethylbenzene analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of o-xylene C13 13C nmr doc brown's advanced organic chemistry revision notes

Advanced Organic Chemistry: Carbon-13 NMR spectrum 1,2-dimethylbenzene

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The Carbon-13 NMR spectrum of 1,2-dimethylbenzene (o-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 1,2-dimethylbenzene

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C-13 NMR spectroscopy - spectra index

C8H10 C-13 nmr spectrum of 1,2-dimethylbenzene analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of o-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 - 1,2-dimethylbenzene here.

1,2-dimethylbenzene, C₈H₁₀, ,

Interpreting the C-13 NMR spectrum of 1,2-dimethylbenzene

As you can see from the diagram above there are 4 different chemical shift lines in the C-13 NMR spectrum of 1,2-dimethylbenzene indicating 4 different chemical environments of the carbon atoms.

On the C-13 NMR spectrum diagram for 1,2-dimethylbenzene you can see chemical shifts (a) to (c) are for the benzene ring carbon atoms and one chemical shift (d) for the side-chain carbon atom of the methyl groups.

The carbon-13 NMR spectra a provides direct evidence of 4 different carbon atom environments in the 1,2-dimethylbenzene molecule from 4 different 13C chemical shifts (ppm).

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