Photoelectron spectra and molecular properties. 76. Radical ions, XX. The hyperconjugative stabilization of p-xylene radical cations by trimethylsilyl substituents
Ionization energies of PhMe and p-xylene derivs. with a-Me3Si groups decrease with increasing a-Me3Si substitution. All p-xylene derivs. show 1st ionization potentials \textless7.8 eV and can be oxidized using AlCl3 in CH2Cl2. ESR-spectral data for radical cations of p-xylene derivs. (e.g., I) confirm the long-range spin delocalization into the (Me3Si)nCH3-n (n = 1-3) groups. The angular dependence of the coupling consts. supports the sCSi/p hyperconjugative interaction postulated, and their temp. dependence yields information on the substituent mobility in the overcrowded radical cations. on SciFinder(R)
%0 Journal Article
%1 Bock.1978
%A Bock, Hans
%A Kaim, Wolfgang
%A Rohwer, Hans E.
%D 1978
%J Chemische Berichte
%K ESR energy ion;ionization radical spectra trimethylsilylbenzene trimethylsilylbenzene;photoelectron
%N 11
%P 3573--3584
%T Photoelectron spectra and molecular properties. 76. Radical ions, XX. The hyperconjugative stabilization of p-xylene radical cations by trimethylsilyl substituents
%V 111
%X Ionization energies of PhMe and p-xylene derivs. with a-Me3Si groups decrease with increasing a-Me3Si substitution. All p-xylene derivs. show 1st ionization potentials \textless7.8 eV and can be oxidized using AlCl3 in CH2Cl2. ESR-spectral data for radical cations of p-xylene derivs. (e.g., I) confirm the long-range spin delocalization into the (Me3Si)nCH3-n (n = 1-3) groups. The angular dependence of the coupling consts. supports the sCSi/p hyperconjugative interaction postulated, and their temp. dependence yields information on the substituent mobility in the overcrowded radical cations. on SciFinder(R)
@article{Bock.1978,
abstract = {Ionization energies of PhMe and p-xylene derivs. with \textgreek{a}-Me3Si groups decrease with increasing \textgreek{a}-Me3Si substitution. All p-xylene derivs. show 1st ionization potentials {\textless}7.8 eV and can be oxidized using AlCl3 in CH2Cl2. ESR-spectral data for radical cations of p-xylene derivs. (e.g., I) confirm the long-range spin delocalization into the (Me3Si)nCH3-n (n = 1-3) groups. The angular dependence of the coupling consts. supports the \textgreek{s}CSi/\textgreek{p} hyperconjugative interaction postulated, and their temp. dependence yields information on the substituent mobility in the overcrowded radical cations. [on SciFinder(R)]},
added-at = {2019-07-15T13:41:23.000+0200},
author = {Bock, Hans and Kaim, Wolfgang and Rohwer, Hans E.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2efa1dc686f79996047d482e024864e8c/b_schwederski},
interhash = {de310fb36d83654090c90361959afd69},
intrahash = {efa1dc686f79996047d482e024864e8c},
issn = {0009-2940},
journal = {Chemische Berichte},
keywords = {ESR energy ion;ionization radical spectra trimethylsilylbenzene trimethylsilylbenzene;photoelectron},
number = 11,
pages = {3573--3584},
timestamp = {2019-07-15T11:42:10.000+0200},
title = {Photoelectron spectra and molecular properties. 76. Radical ions, XX. The hyperconjugative stabilization of p-xylene radical cations by trimethylsilyl substituents},
volume = 111,
year = 1978
}
