Through-bond spin coupling involving vinylic nuclei. The geometry of a vicinal pathway across an alkene distinguishes cis and trans coupling.
vicinal coupling between protons on the same side of an alkene. A measured first-order splitting is an approximation if the spin system is appreciably strongly coupled.
vicinal coupling between protons on opposite sides of an alkene. In many ordinary terminal alkenes its magnitude exceeds the corresponding cis coupling.
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