Illustrated Glossary of Organic Chemistry - First-order splitting

Illustrated Glossary of Organic Chemistry

First-order splitting: In NMR spectroscopy, signal splitting due to first order coupling. The n+1 rule is obeyed; 'normal' doublets, triplets, quartets, etc. result.

First order coupling J_ab = J_ac		Non-first-order coupling J_ab ≠ J_ac

First-order splitting results The n+1 rule is obeyed A triplet is observed		Non-first-order splitting results The n+1 rule is not obeyed A doublet of doublets is observed

Related terms: Coupling constant, pentet, sextet, septet, multiplet, doublet of triplets, triplet of doublets, first order (kinetics)
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