Through-bond coupling over a longer path, often four or more bonds. Small resolved allylic couplings can split alkene and oxygen-bound methylene signals and should not be discarded merely because vicinal couplings are larger.
Coupling across an allylic four-bond path, such as between an oxygen-bound CH2 group and terminal vinyl hydrogens in an allyl ester.

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  1. Scalar spin-spin coupling
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