Common ¹H NMR Splitting Patterns

The examples given above represent only the simplest and most common coupling patterns seen in the ¹H NMR.

A simple ethyl group displays a quartet and a triplet in the ratio 2:3; the chemical shift of the CH₂ group is sensitive to the attached substituent and typically varies between d 4 (for oxygen) to d 2 (for a carbonyl).

An isopropyl group displays a septet (7 peaks) and a doublet in the ratio 1:6; again, the chemical shift of the CH₂ group is sensitive to the attached substituent and typically varies between d 4 (for oxygen) to d 2 (for a carbonyl).

A 1,4-disubstituted aromatic compound displays two doublets in the ratio of 1:1, typically in the region around d 7.

In spite of the fact that there are three different types of hydrogens in a monosubstituted aromatic compound, the ¹H NMR typically displays a single peak in the region around d 7. This is because the differences in chemical shift are typically small, as are the coupling constants.