Advanced Organic Chemistry: Carbon-13 NMR spectrum of 1,1-dibromoethane CH3CHBr2

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Interpreting the 13C NMR spectrum of 1,1-dibromoethane

[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 - analysing the 13C NMR spectrum of 1,1-dibromoethane [spectra page updated Mar 16th 2026 *]

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Introductory note on the 13C NMR spectrum of 1,1-dibromoethane

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

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

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

C2H4Br2 CH3CHBr2 C-13 nmr spectrum of 1,1-dibromoethane analysis of chemical shifts ppm interpretation of 13C chemical shifts ppm of 1,1-dibromoethane 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 - 1,1-dibromoethane here.

1,1-dibromoethane, C2H4Br2, CH3CHBr2

The molecular structure and naming of haloalkanes

Interpreting the C-13 NMR spectrum of 1,1-dibromoethane

As you can see from the diagram above there are 2 different C-13 NMR  chemical shift lines in the C-13 NMR spectrum of 1,1-dibromoethane indicating 2 different chemical environments of the 2 carbon atoms of 1,1-dibromoethane.

CH3CHBr2

(Note the 2 different colours indicating the 2 different chemical environments of the carbon atoms in 1,1-dibromoethane).

13C chemical shifts (a) to (b) on the C-13 NMR spectrum diagram for 1,1-dibromoethane.

The carbon-13 NMR spectra a provides direct evidence of 2 different carbon atom environments for the 2 carbon atoms of 1,1-dibromoethane and this arises because both bromine atoms are attached to the same carbon atom in 1,1-dibromoethane, so the carbon atoms are not equivalent to each other.

Key words & phrases: C2H4Br2 CH3CHBr2 Interpreting the C-13 NMR spectra of 1,1-dibromoethane, C-13 nmr spectrum of 1,1-dibromoethane, understanding the carbon-13 nmr spectrum of 1,1-dibromoethane, explaining the line pattern in the high resolution C-13 nmr spectra of 1,1-dibromoethane, revising the C-13 nmr spectrum of 1,1-dibromoethane, ppm chemical shifts of the C-13 nmr spectrum of 1,1-dibromoethane, how to construct the diagram of the C-13 nmr spectrum of 1,1-dibromoethane, how to analyse the chemical shifts in the carbon-13 NMR spectrum of 1,1-dibromoethane deducing the chemical environment of all the carbon atoms in 1,1-dibromoethane examining the c13 nmr spectrum of  1,1-dibromoethane analysing the 13-c nmr spectrum of 1,1-dibromoethane how do you sketch and interpret the C-13 NMR spectrum of 1,1-dibromoethane interpreting interpretation of the C-13 NMR spectrum of 1,1-dibromoethane assignment of chemical shifts in the 13C NMR spectrum of 1,1-dibromoethane How do you interpret the chemical shifts of the C-13 NMR spectrum of 1,1-dibromoethane How to interpret the C-13 NMR spectrum of 1,1-dibromoethane Explanatory diagram of the 13C C-13 carbon-13 NMR spectrum of the  number of different carbon atom environments in the 1,1-dibromoethane molecule from its carbon-13 NMR spectrum to help work out the molecular structure of the 1,1-dibromoethane molecule? The uses and distinctive features of the carbon-13 NMR spectrum of the 1,1-dibromoethane molecule explained. What do the number and values of the chemical shifts from the c-13 carbon-13 NMR spectrum tell us about the 1,1-dibromoethane molecule? explaining the decoupled carbon-13 NMR spectrum of 1,1-dibromoethane  with a detailed interpretation diagram of all the C-13 chemical shifts and intensities

Links associated with 1,1-dibromoethane

The infrared spectrum of 1,1-dibromoethane

The infrared spectrum of 1,2-dibromoethane

The mass spectrum of 1,1-dibromoethane

The mass spectrum of 1,2-dibromoethane

The H-1 NMR spectrum of 1,1-dibromoethane

The H-1 NMR spectrum of 1,2-dibromoethane

The C-13 NMR spectrum of 1,2-dibromoethane

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