The spectrum of the allyl group in allyl amine is discussed in detail. The interpretation of the spectra of 1-butene and 3,3-dimethyl-1-butene are also discussed. It is shown how the chemical shifts, spin-spin interactions, and in particular the relative signs of the latter can be determined by numerical methods. In all three molecules all spin-spin interactions among the vinyl protons have the same sign. One of the three vinyl-methylene interactions is found to have a different sign than the other two. This interaction has the same sign (and approximately the same magnitude) as the methyl-methylene interaction in 1-butene.
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S. Alexander (1960) studied this question.
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