Question: 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

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, H_a, couple with the vinylic proton H_b, it also couples with the vinylic proton H_C, four carbon atoms away. The data are: Construct tree diagrams that account for the observed splitting patterns of ?H_a? H_b, and H_C

CH30 - Ha (3.08 8) H, (4.52 8) He (6.35 8) Jpc=7

CH30 - Ha (3.08 8) H, (4.52 8) He (6.35 8) Jpc=7 Hz Ja-b = 3 Hz Ja-c = 1 Hz Ha-CEC-C 1-Methoxy-1-buten-3-yne

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