Premium
Ionization Energies of Methyl‐substituted[2.2]Paracyclophanes
Author(s) -
Zhongzhi Yang,
Kovač Branka,
Heilbronner Edgar,
Eltamany Sayed,
Hopf Henning
Publication year - 1981
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19810640704
Subject(s) - chemistry , ionization , ionization energy , spectral line , alkyl , methyl group , computational chemistry , stereochemistry , crystallography , organic chemistry , ion , physics , astronomy
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.