1H-NMR and 13C-NMR for a heterocyclic aldehyde. Notice the correlation between the chemical shifts in the two spectra. The proton spectrum has a sweep width of 10 ppm, and the carbon spectrum has a width of 200 ppm.
The peak areas of the 13C-NMR are not proportional to the number of carbons giving rise to the peaks. Carbons with no protons attached to them usually give rise to small peaks. In the proton spin decoupled 13C-NMR each carbon signal appears as a unsplit singlet. The heterocyclic aldehyde has 5 carbons all in different environments so the spectrum will show 5 peaks.
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