Die kernmagnetischen resonanzspektren substituierter trans-stilbene

The NMR spectra of mono-and disubsituted trans-stilbenes have been recorded in CDCl3 and the influence of ring substituents discussed

H Güsten; M Salzwedel

2002

Scholarcy highlights

  • The NMR spectra of mono-and disubsituted trans-stilbenes have been recorded in CDCl3 and the influence of ring substituents discussed
  • Electron donating substituents enhance the magnetic shielding of the olefinic protons, while electron withdrawing substituents reduce the magnetic shielding
  • The chemical shifts of the olefinic protons show a rough correlation with the σ-values of Hammett
  • A better correlation is obtained by applying the Taft combination 0·40 σI + 0·70 σR, which can be employed for m-substituted stilbenes
  • The change in electron density with ring substitution in the stilbene molecule is transmitted to the olefinic double bond by resonance interaction

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