Illustrated Glossary of Organic Chemistry

Nondecoupled: In NMR spectroscopy, nuclei which are not decoupled (i.e., they remain coupled).

Nondecoupled ¹H-NMR spectrum of CH₃CH₂Br. The signals are split into a quartet for the CH₂ protons and a triplet for the CH₃ protons.


Decoupled ¹H-NMR spectrum of CH₃CH₂Br. The signals are not split, and each is a singlet.