Proton NMR: why does this appear as a multiplet?

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Discussion Overview

The discussion revolves around the interpretation of proton NMR spectra, specifically focusing on why certain protons in a given molecule appear as a multiplet. Participants are attempting to analyze the chemical shifts and coupling patterns of protons in the context of a homework problem.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses confusion about the concept of a multiplet in NMR spectroscopy.
  • Another participant suggests that the presence of two doublet protons and one singlet proton should yield a doublet of triplets or a triplet of doublets.
  • A question is raised regarding why a specific proton (D) does not appear as a multiplet.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the nature of the multiplet or the specific roles of the protons in the NMR spectrum, indicating that multiple competing views remain.

Contextual Notes

There is a lack of clarity regarding the definitions and assumptions related to multiplets in NMR, as well as the specific interactions between the protons mentioned.

Mitocarta
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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.
 
Last edited:
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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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