Organic Chemistry
Organic Chemistry
2nd Edition
ISBN: 9781118452288
Author: David R. Klein
Publisher: WILEY
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Chapter 18, Problem 48PP
Interpretation Introduction

Interpretation: For the given compounds, number of signals in 13CNMR spectrum should be found

Concept introduction:

  • The carbon atoms of aromatic rings typically produce signals in the range of 100-150ppm in 13C NMR spectrum. The number of signals is very helpful in determining the specific substitution for substituted aromatic ring.
  • The 13CNMR spectrum gives information on the different electronic environments of carbon. As like 1HNMR , the number of signals generated in 13CNMR are predicted by performing symmetry operations (rotation or reflection symmetry). Only chemical shift values are reported in the spectrum but not the multiplicity and integration values because the coupling between two neighboring 13C13C nuclei are weakly involved due to the low abundance of 13C isotopes of carbon atom.

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