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Ionization Energies of Methyl-substituted[2.2]Paracyclophanes

✍ Scribed by Yang Zhong-zhi; Branka Kovač; Edgar Heilbronner; Sayed Eltamany; Henning Hopf

Publisher
John Wiley and Sons
Year
1981
Tongue
German
Weight
532 KB
Volume
64
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The photoelectron (PE.) spectra of thirteen methyl‐substituted [2.2]paracyclophanes have been recorded and analyzed, to assess the influence of methyl‐substitution on their ionization energies. It is shown that this influence is qualitatively and quantitatively the same as for benzenes and other π‐systems. Comparison with the previous results obtained for the [2~r~]cyclophanes (r=2 to 6) strongly suggests that the hyperconjugative model for alkyl‐group/π‐system interactions is more appropriate than the inductive one.

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