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Common H NMR Splitting Patterns

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

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

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

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