Advanced Organic Chemistry: Carbon-13 NMR spectrum of propylbenzene (1-phenlypropane)

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Interpreting and explaining the Carbon-13 NMR spectrum of propylbenzene (1-phenylpropane)

[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 propylbenzene [spectra updated Mar 28th 2026 *]

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 C-13 NMR spectroscopy - spectra index


Introductory note on the 13C NMR spectrum of propylbenzene

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

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

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

C9H12 C-13 nmr spectrum of propylbenzene analysis of chemical shifts ppm interpretation of 13C chemical shifts ppm of 1-phenylpropane 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 - propylbenzene here.

propylbenzene, 1-phenylpropane, C9H12 , C6H5CH2CH2CH3 , (c) doc b  , (c) doc b 

The molecular structure and naming of aromatic compounds

The molecular structure and naming of alkanes

Interpreting the C-13 NMR spectrum of propylbenzene

C6H5CH2CH2CH3

As you can see from the diagram above there are 7 different 13C chemical shift lines in the C-13 NMR spectrum of propylbenzene indicating 7 different chemical environments of the carbon atoms, but they are observed as two closely related groups - aryl and alky group carbon atoms..

(i) On the C-13 NMR spectrum diagram for propylbenzene you can see four chemical shifts (a) to (d) are for the benzene ring carbon atoms and ...

(ii) three 13C chemical shifts (e) to (g) for the side-chain carbon atoms of the alkyl propyl group CH2CH2CH3.

Note the arene aromatic carbon atoms of the benzene ring have significantly larger 13C chemical shifts than the propyl alkyl group of carbon atoms, so you get two 'bunches' of 13C NMR chemical shifts in propylbenzene.

The carbon-13 NMR spectra a provides direct evidence of 7 different carbon atom environments in the propylbenzene molecule from 7 different 13C chemical shifts (ppm).


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The infrared spectrum of propylbenzene

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The H-1 NMR spectrum of Propylbenzene

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