13C nmr spectrum of N-methylethanamine (ethylmethylamine) C3H9N CH3NHCH2CH3 analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of N-methylethylamine C13 13-C nmr doc brown's advanced organic chemistry revision notes

Advanced Organic Chemistry: ¹³C NMR spectrum of N-methylethanamine (ethylmethylamine) CH₃CH₂NHCH₃

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Interpreting and explaining the Carbon-13 NMR spectrum of N-methylethanamine (N-methylethylamine)

[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 spectra of ethylmethylamine [spectra page updated April 3rd 2026 *]

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Introductory note on the 13C NMR spectrum of N-methylethanamine (ethylmethylamine)

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

The description does not involve the chemical shift δ spin-spin coupling effects for N-methylethanamine (ethylmethylamine) 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 N-methylethanamine (ethylmethylamine) molecule.

The most common solvent used for investigating the 13C NMR spectrum of compounds like N-methylethanamine (ethylmethylamine), is CDCl₃ and other deuterated solvents.

13C nmr spectrum of N-methylethanamine (ethylmethylamine) C3H9N CH3NHCH2CH3 analysis of chemical shifts ppm interpretation of C-13 chemical shifts ppm of N-methylethylamine 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 - N-methylethanamine (ethylmethylamine) here.

N-methylethanamine, N-methylethylamine, ethylmethylamine, (c) doc b ,

The classification, structure and naming of organic nitrogen compounds

Interpreting the C-13 NMR spectrum of N-methylethanamine (ethylmethylamine)

As you can see from the diagram above there are 3 different ¹³C chemical shift lines in the C-13 NMR spectrum of N-methylethanamine (ethylmethylamine) indicating 3 different chemical environments of the 3 carbon atoms of N-methylethanamine (ethylmethylamine).

CH₃NHCH₂CH₃

(Note the 3 different colours indicating the 3 different chemical environments of the 3 carbon atoms in N-methylethanamine (ethylmethylamine)).

¹³C chemical shifts (a) to (c) on the C-13 NMR spectrum diagram for N-methylethanamine (ethylmethylamine).

Non of the carbon atoms are equivalent to each other because of the asymmetry of the N-methylethylamine molecule.

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

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The infrared spectra of N-methylethylamine (N-methylethanamine, ethylmethylamine)

The mass spectra of N-methylethylamine (N-methylethanamine, ethylmethylamine)

The H-1 NMR spectra of N-methylethylamine (N-methylethanamine, ethylmethylamine)

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