Proton NMR: why does this appear as a multiplet?

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The discussion centers on understanding why a specific proton signal appears as a multiplet in Proton NMR. The user is confused about the concept of a multiplet and seeks clarification on the signal from protons in the molecule. They mention having two "d" protons and one "b" proton, which should theoretically result in a doublet of triplets or a triplet of doublets. Additionally, there is a question raised about why another signal, referred to as "D," is not classified as a multiplet. The conversation highlights the complexities of interpreting NMR signals in relation to proton environments.
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Homework Statement



It asks you to identify the shift and nature of the protons in the molecule.

Picture:

https://mailhost-6.tamu.edu/service/home/~/?auth=co&id=24393&part=2

multiplet.gif


Homework Equations



none

The Attempt at a Solution



I cannot understand what makes C a multiplet. I suppose I am confused about the concept of a multiplet in general.
 
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Sorry, no picture.
 
sorry. what about now?
 
Mitocarta said:
I cannot understand what makes C a multiplet.

Two d protons and single b proton. Together they should yield doublet of triplets (or triplet of doublets).
 
Borek said:
Two d protons and single b proton. Together they should yield doublet of triplets (or triplet of doublets).

why is D not a multiplet ?
 

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