Abstract
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)
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