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Advanced Organic Chemistry: Carbon-13 NMR spectrum of cyclohexane

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The Carbon-13 NMR spectrum of cyclohexane

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 cyclohexane

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C-13 NMR spectroscopy - spectra index

C6H12 C-13 nmr spectrum of cyclohexane analysis of chemical shifts ppm interpretation of 13C chemical shifts ppm of cyclohexane 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 - cyclohexane here.

Cyclohexane, C6H12 , alkanes structure and naming (c) doc b , alkanes structure and naming (c) doc b , all bond angles ~109o

Interpreting the C-13 NMR spectrum of cyclohexane

As you can see from the diagram above there is only one chemical shift lines in the C-13 NMR spectrum of cyclohexane indicating all six carbon atoms are in the same chemical environment.

The carbon-13 NMR spectra a provides direct evidence of  a single chemical environment for all six carbon atoms in the cyclohexane molecule, deduced from the presence of just one chemical shift 13C NMR spectral line at 27.1 ppm.

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