Science & Fun | Home |  Introduction into the 1H NMR Spectroscopy

94

You would expect to observe a doublet if the proton HA would interact only with the proton HM (n = 1, and therefore M = 2)!

However, the protons HX are also separated from HA by only three bonds
(
ClCH = CH - CH2Cl
M   A   X
), and they also should contribute to the splitting of the energy levels of
HA!

You might want to check the summary on page 95 for additional explanations!