The chemical shifts (d) of solvent signals observed for 1 H NMR and 13 C NMR spectra are listed in the following table. The multiplicity is shown in parentheses as 1 for singlet, 2 for doublet, 3 for ...

An NMR signal must be substantially bigger than the noise level to investigate. A minimum requisite for an S/N level might be 3:1. In standard 1 H NMR experiments of small organic molecules.

Image Credit: Nanalysis Corp. In the amide, N,N–dimethylacetamide (DMA), two different signals are observed on the 1 H NMR spectrum as two methyl groups bond to the nitrogen (Figure 1).