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Advanced Organic Chemistry: Carbon-13 NMR spectrum of ethanal

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The Carbon-13 NMR spectrum of ethanal (acetaldehyde)

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing C-13 NMR spectra of ethanal

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C-13 NMR spectroscopy - spectra index

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

Ethanal (acetaldehyde), C2H4O, aldehydes and ketones nomenclature (c) doc b , aldehydes and ketones nomenclature (c) doc b , aldehydes and ketones nomenclature (c) doc b , aldehydes and ketones nomenclature (c) doc b

Interpreting the C-13 NMR spectrum of ethanal

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

CH3CHO 

(Note the 2 colours indicating the 2 different chemical environment of the carbon atoms in ethanal).

Note the decreasing effect on the chemical shift as the carbon atom is further from the highly electronegative oxygen atom of ethanal.

The carbon-13 NMR spectra a provides direct evidence of 2 different carbon atom environments in the ethanal molecule from 2 different chemical shifts (ppm).


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Links associated with ethanal

The infrared spectrum of ethanal (acetaldehyde)

The mass spectrum of ethanal (acetaldehyde)

The H-1 NMR spectrum of ethanal (acetaldehyde)

The chemistry of ALDEHYDES and KETONES revision notes INDEX

C-13 NMR spectroscopy index

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