The review deals with chemical reactions of radical cations. Only few
examples are given. Intramolecular reactions of organic radical cation
s are illustrated on carbon-carbon bond cleavage reactions. Intermolec
ular reactions between radical cation and other molecule are illustrat
ed on nucleophilic and pericyclic reactions, on radical cation reactio
ns with free radicals and on radical cation-catalyzed chain oxygenatio
n of olefins. The last chapter presents the reactions of radical catio
ns formed on irradiated surfaces of semiconductors. On the basis of el
ectron and/or hole transfer processes, new reaction mechanisms are dis
cussed.