Recent advances in the understanding of the gas-phase reaction of aromatics with cationic electrophiles in a thermally equilibrated domain are described. The overall substitution reaction is analyzed in terms of its elementary steps. Their contribution to the overall reactivity pattern is dissected by the use of selected systems, which allowed one to highlight the kinetic role of single elementary events. Mechanistic studies have focused on the structure and reactivity of covalent and non-covalent ionic intermediates, which display a rich chemistry and provide benchmark reactivity models. Particular interest has been devoted to proton transfer reactions, which may occur in either an intra- or intermolecular fashion in arenium intermediates. A quantitative study of their rates and associated kinetic isotope effects is reported.
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Simonetta Fornarini (1996) studied this question.
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