Advanced Organic Chemistry: Carbon-13 NMR spectrum of chlorobenzene C6H5Cl

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Interpreting the 13C NMR spectrum of chlorobenzene C6H5Cl

[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 chlorobenzene [spectra page updated Mar 22nd 2026 *]

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 C-13 NMR spectroscopy - spectra index

Introductory note on the 13C NMR spectrum of chlorobenzene

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

The description does not involve the chemical shift δ spin-spin coupling effects for chlorobenzene 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 chlorobenzene molecule.

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

C6H5Cl C-13 nmr spectrum of chlorobenzene analysis of chemical shifts ppm interpretation of 13C chemical shifts ppm of chlorobenzene C13 13-C 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 - chlorobenzene here.

chlorobenzene, C6H5Cl, (c) doc b    monosubstituted benzene compound

Interpreting the C-13 NMR spectrum of chlorobenzene

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

Chemical shifts (a) to (d) on the C-13 NMR spectrum diagram for chlorobenzene.

These are all due to the benzene ring (no side-chain carbons).

Very high resolution spectrum sorts them out.

13C resonance (a) is for ring carbon atom 4, 126.4 ppm.

13C resonance (b) is for ring carbon atoms 3 and 5, 129.7 ppm.

13C resonance (c) is for ring carbon atoms 2 and 6, 128.6 ppm.

13C resonance (d) is for ring carbon atom 1, 134.3 ppm.

The carbon-13 NMR spectra a provides direct evidence of 4 different carbon atom environments of the 6 carbon atoms of the chlorobenzene molecule from 4 different 13C chemical shifts (ppm).

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