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78 |
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Answer
The signal of the proton X is a doublet,
since the two equivalent protons X are
coupling with a single proton A (See
page 74 for an explanation).
So far you have come up with the following answers:
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| Fine structure of the signal |
|
Due to coupling with |
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| Singulet (M = 1) |
|
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} |
other
equivalent
protons |
| Doublet (M = 2) |
|
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| Triplet (M = 3) |
|
 |
The general rule therefore is:
The signal of one or several equivalent protons is a multiplet
with a multiplicity of
M = n + 1, if the proton(s) couples with n
other equivalent protons!
-
Multiplicity
M = n + 1 |
|
Relative intensities
of the individual
multiplet lines |
| M = 2 |
|
 |
| M = 3 |
|
 |
| M = 4 |
|
 |
The general rule therefore is:
The relative intensities of the individual multiplet lines
follow the same patterns as the nth binominal coefficients!
Now try again to solve the problem!
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