Advanced Organic Chemistry: Carbon-13 NMR spectrum of 2-iodopropane CH3CHICH3

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Interpreting and explaining the Carbon-13 NMR spectrum of 2-iodopropane

[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 2-iodopropane (13C NMR spectra) [spectra page updated April 1st 2026 *]

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 C-13 NMR spectroscopy - spectra index

Introductory note on the 13C NMR spectrum of 2-iodopropane

Students and teachers please note that my explanation of the carbon-13 NMR spectrum of 2-iodopropane is designed for advanced, but pre-university, chemistry courses.

The description does not involve the chemical shift δ spin-spin coupling effects for 2-iodopropane 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 2-iodopropane molecule.

The most common solvent used for investigating the 13C NMR spectrum of compounds like 2-iodopropane, is CDCl3 and other deuterated solvents.

13C nmr spectrum of 2-iodopropane C3H7I CH3CHICH3 analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of isopropyl iodide 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 resonances, called chemical shifts, are measured with respect to the TMS, and depend on the individual (electronic) chemical environment of the 13C atoms in an organic molecule - 2-iodopropane here.

2-iodopropane, C3H7I, CH3CHICH3, CH3-CHI-CH3

The molecular structure and naming of haloalkanes

Interpreting the C-13 NMR spectrum of 2-iodopropane

As you can see from the diagram above there are 2 different 13C chemical shift lines in the C-13 NMR spectrum of 2-iodopropane indicating 2 different chemical environments of the 3 carbon atoms of 2-iodopropane.

CH3-CHI-CH3

(Note the 2 different colours indicating the 2 different chemical environments of the 3 carbon atoms in 2-iodopropane).

13C chemical shifts (a) to (b) on the C-13 NMR spectrum diagram for 2-iodopropane.

(a) 13C NMR chemical shift of 31.2 ppm for the carbon atoms of the methyl groups.

(b) 13C NMR chemical shift of 21.1 ppm for the carbon atom of the CH group attached to the iodine atom.

The carbon-13 NMR spectra provides direct evidence of 2 different carbon atom environments for the 3 carbon atoms in the 2-iodopropane molecule, deduced from the presence of only 2 different 13C NMR chemical shifts (ppm).

Key words & phrases: C3H7I CH3CHICH3 Interpreting the C-13 NMR spectra of 2-iodopropane, C-13 nmr spectrum of 2-iodopropane, understanding the carbon-13 nmr spectrum of 2-iodopropane, explaining the line pattern in the high resolution C-13 nmr spectra of 2-iodopropane, revising the C-13 nmr spectrum of 2-iodopropane, ppm chemical shifts of the C-13 nmr spectrum of 2-iodopropane, how to construct the diagram of the C-13 nmr spectrum of 2-iodopropane, how to analyse the chemical shifts in the carbon-13 NMR spectrum of 2-iodopropane deducing the chemical environment of all the carbon atoms in 2-iodopropane examining the c13 nmr spectrum of  2-iodopropane analysing the 13-c nmr spectrum of 2-iodopropane how do you sketch and interpret the C-13 NMR spectrum of 2-iodopropane interpreting interpretation of the C-13 NMR spectrum of 2-iodopropane assignment of chemical shifts in the 13C NMR spectrum of 2-iodopropane type isopropyl iodide alkyl halide functional group haloalkane halogenoalkane iodoalkane How do you interpret the chemical shifts of the C-13 NMR spectrum of 2-iodopropane How to interpret the C-13 NMR spectrum of 2-iodopropane Explanatory diagram of the 13C C-13 carbon-13 NMR spectrum of the  number of different carbon atom environments in the 2-iodopropane molecule from its carbon-13 NMR spectrum to help work out the molecular structure of the 2-iodopropane molecule? The uses and distinctive features of the carbon-13 NMR spectrum of the 2-iodopropane molecule explained. What do the number and values of the chemical shifts from the c-13 carbon-13 NMR spectrum tell us about the 2-iodopropane molecule? explaining the decoupled carbon-13 NMR spectrum of 2-iodopropane  with a detailed interpretation diagram of all the C-13 chemical shifts and intensities

Links associated with 2-iodopropane

The chemistry of HALOGENOALKANES (haloalkanes) revision notes INDEX

The infrared spectrum of 2-iodopropane (isopropyl iodide)

The mass spectrum of 2-iodopropane (isopropyl iodide)

The H-1 NMR spectrum of 2-iodopropane (isopropyl iodide)

C-13 NMR spectroscopy index

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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 (on the 13C NMR spectrum of 2-iodopropane) 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.

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