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Compare your reasoning with the explanation given below:

  1. The methyl group in acetaldehyde can rotate almost freely around around the C-C single bond. Therefore the methyl protons are exposed to a shielding averaged over time.
  2. The methyl protons are equivalent if averaged over the NMR time scale, and give only a single NMR signal.
Do you want a more detailed explanation of these points? Check page21!

Considering what you have learned so far, would you expect in a 1H-NMR-spektrum of propionaldehyde CH3-CH2-CHO at room temperature
3 signals?
4 signals?
6 signals?