Abstract: The relative order of charge delocalization by neighboring phenyl, cyclopropyl, and methyl groups in related series of stable, long-lived carbocations was studied by 13C nmr spectroscopy. The decreasing order of charge delocalization was generally found to be Ph> c-Pr> CH3. The results are interpreted in terms of differentiating delocalization in the intermediate ions (as measured by cmr spectroscopy) from participation of the same ...
