Advanced Organic Chemistry: Carbon-13 13C NMR spectrum of Pent-1-ene H2C=CHCH2CH2CH3

HOME PAGE * SEARCH * GCSE Level Chemistry age ~14-16 * Advanced Level Chemistry age ~16-19

Interpreting the Carbon-13 NMR spectrum of Pent-1-ene (1-pentene)

[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 pent-1-ene [spectra page updated Mar 25th 2026 *]

 email doc brown  Re-edit 13C NMR spectrum of CH3CH2CH2CH=CH2

This is a BIG website, PLEASE take time to explore it

Associated links for pent-1-ene (1-pentene)

C-13 NMR spectroscopy - spectra index  *  [privacy policy, cookies and disclaimer]

Introductory note on the 13C NMR spectrum of pent-1-ene

Students and teachers please note that my explanation of the carbon-13 NMR spectrum of pent-1-ene is designed for advanced, but pre-university, chemistry courses.

The description does not involve the chemical shift δ spin-spin coupling effects for pent-1-ene 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 pent-1-ene molecule.

The most common solvent used for investigating the C13 NMR spectrum of compounds like pent-1-ene, is CDCl3 and other deuterated solvents.

C-13 nmr spectrum of pent-1-ene 1-pentene analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of pent-1-ene 1-pentene 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 - pent-1-ene here.

Pent-1-ene, alkenes structure and naming (c) doc b , alkenes structure and naming (c) doc b , alkenes structure and naming (c) doc b (1-pentene)

an alkene The molecular structure and naming of alkenes

Interpreting the C-13 NMR spectrum of pent-1-ene (1-pentene)

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

CH3CH2CH2CH=CH2

(note the 5 different colours indicating the different chemical environment of the carbon atoms)

The carbon atoms of a double C=C bond tend to have larger 13C NMR chemical shifts than alkyl group carbon atoms.

There are 5 carbon atoms in the molecule, and there are 5 different chemical environments, so you observe 5 different chemical shifts.

The 13C NMR chemical shifts tend to much higher for the unsaturated carbon atoms of the C=C double bond compared to those not so.

Key words & phrases: Interpreting the C-13 NMR spectra of pent-1-ene 1-pentene, C-13 nmr spectrum of pent-1-ene 1-pentene, understanding the carbon-13 nmr spectrum of pent-1-ene 1-pentene, explaining the line pattern in the high resolution C-13 nmr spectra of pent-1-ene 1-pentene, revising the C-13 nmr spectrum of pent-1-ene 1-pentene, ppm chemical shifts of the C-13 nmr spectrum of pent-1-ene 1-pentene, how to construct the diagram of the C-13 nmr spectrum of pent-1-ene 1-pentene How do you interpret the chemical shifts of the C-13 NMR spectrum of pent-1-ene (1-pentene) How to interpret the C-13 NMR spectrum of pent-1-ene (1-pentene) Explanatory diagram of the 13C C-13 carbon-13 NMR spectrum of the  number of different carbon atom environments in the pent-1-ene (1-pentene) molecule from its carbon-13 NMR spectrum to help work out the molecular structure of the pent-1-ene (1-pentene) molecule? The uses and distinctive features of the carbon-13 NMR spectrum of the pent-1-ene (1-pentene) molecule explained. What do the number and values of the chemical shifts from the c-13 carbon-13 NMR spectrum tell us about the pent-1-ene (1-pentene) molecule? explaining the decoupled carbon-13 NMR spectrum of pent-1-ene (1-pentene)  with a detailed interpretation diagram of all the C-13 chemical shifts and intensities How do you interpret the chemical shifts of the C-13 NMR spectrum of pent-1-ene How to interpret the C-13 NMR spectrum of pent-1-ene Explanatory diagram of the 13C C-13 carbon-13 NMR spectrum of the  number of different carbon atom environments in the pent-1-ene molecule from its carbon-13 NMR spectrum to help work out the molecular structure of the pent-1-ene molecule? The uses and distinctive features of the carbon-13 NMR spectrum of the pent-1-ene molecule explained. What do the number and values of the chemical shifts from the c-13 carbon-13 NMR spectrum tell us about the pent-1-ene molecule? explaining the decoupled carbon-13 NMR spectrum of pent-1-ene  with a detailed interpretation diagram of all the C-13 chemical shifts and intensities

What next? Associated links for pent-1-ene (1-pentene)

The infrared spectrum of pent-1-ene (1-pentene)

The mass spectrum of Pent-1-ene (1-pentene)

The H-1 NMR spectrum of Pent-1-ene (1-pentene)

The chemistry of ALKENES revision notes INDEX

C-13 NMR spectroscopy index

ALL SPECTROSCOPY INDEXES

All Advanced Organic Chemistry Notes

Use My Google search site box

Email doc b: chem55555@hotmail.com

Website content © Dr Phil Brown 2000+. All copyrights reserved on revision notes, images, quizzes, worksheets etc. Copying of Doc Brown's pre-university advanced level chemistry website material is NOT permitted. Exam revision summaries & references to science course specifications are unofficial. These organic chemistry revision notes on spectroscopy are suitable for use of pre-university students studying AQA advanced level chemistry, Edexcel advanced level chemistry, OCR advanced level chemistry, IB advanced level chemistry, WJEC (Eduqas) advanced level chemistry, CIE advanced level chemistry, CCEA advanced level chemistry, US grade 11-12 AP honors chemistry courses and they will also prove useful to 1st year undergraduate students of chemistry.

TOP OF PAGE