Stereochemical Analysis of Alicyclic Compounds by C-13 NMR Spectroscopy

Released on by J. A. Whitesell
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  • Stereochemical Analysis of Alicyclic Compounds by C-13 NMR Spectroscopy Book Detail

  • Author : J. A. Whitesell
  • Release Date : 2012-12-06
  • Publisher : Springer Science & Business Media
  • Genre : Science
  • Pages : 213
  • ISBN 13 : 9400931611
  • File Size : 95,95 MB
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Stereochemical Analysis of Alicyclic Compounds by C-13 NMR Spectroscopy by J. A. Whitesell PDF Summary

Book Description: Through numerous conversations with other synthetic chemists it became apparent that the great power of carbon nuclear magnetic resonance was being significantly underutilized. In our own work we have found that 13C spectroscopy is a more powerful tool than IH NMR spectroscopy, especially for probing subtle stereochemical questions in complicated systems. This is especially true in five membered ring compounds where IH NMR is at a particular disadvantage. The two techniques can be used independently to solve the same question-that of stereochemistry - but they do so in different ways. Advantage can be taken in IH NMR of a relatively consistent relationship between stereochemical orientation and coupling constants between vicinal protons, while in 13C NMR it is the correlation between spatial relationships of non-hydrogen, y substituents and their effect on chemical shift that can be used to assign stereochemistry. It was also clear that the use of 13C NMR required a different approach to problem solving than that typically used with IH NMR. While the latter technique could be employed with a very general approach (e.g., the Karplus equation), 13C NMR would, at least for the immediate future, require a relatively extensive set of model systems from which the consequences of stereochemical changes could be derived for any given carbon framework.

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