C-13 nmr spectrum of cyclopentane analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of cyclopentane C13 13-C nmr doc brown's advanced organic chemistry revision notes

Advanced Organic Chemistry: Carbon-13 NMR spectrum of cyclopentane cyclo-C₅H₁₀

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Interpreting the Carbon-13 NMR spectrum of cyclopentane

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

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C-13 NMR spectroscopy - spectra index

Introductory note on the 13C NMR spectrum of cyclopentane

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

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

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

C-13 nmr spectrum of cyclopentane analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of cyclopentane 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 - cyclopentane here.

Cyclopentane, C₅H₁₀ , , , all bond angles ~109^o, but it is NOT planar, pentagon is slightly bent.

The molecular structure and naming of alkanes

Interpreting the C-13 NMR spectrum of cyclopentane

As you can see from the diagram above there is only one chemical shift line in the C-13 NMR spectrum of cyclopentane indicating only one unique chemical environment of the carbon atoms.

All five carbon atoms in cyclopentane are equivalent to each other and their ¹³C fields cannot cause spin-spin coupling splitting effects in the carbon-13 NMR spectrum.

The cyclopentane molecule is slightly bent (or folded), but the oscillations of the bonds in the molecule mean that over a finite period of time, any tiny individual differences in the chemical environment of the carbon atoms is averaged out, so all you see is one 13-C NMR resonance line in the spectrum of cyclopentane.

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The infrared spectrum of cyclopentane

The mass spectrum of cyclopentane

The H-1 NMR spectrum of cyclopentane

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