Long-range coupling between protons more than two carbon atoms apart is sometimes observed when ? bonds intervene.
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Long-range coupling between protons more than two carbon atoms apart is sometimes observed when ? bonds intervene. An example is found in 1-methoxy-1-buten-3-yne. Not only does the acetylenic proton, Ha, couple with the vinylic proton Hb, it also couples with the vinylic proton HC, four carbon atoms away. The data are: Construct tree diagrams that account for the observed splitting patterns of ?Ha? Hb, and HC
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