Chemical reactivities of the cation and anion of M@C82 (M = Y, La, and Ce)

The chemical reduction and oxidation of M @ C-82 (M = Y, La, and Ce) afford the corresponding anion and cation, respectively, which show unique and interesting chemical reactivities. It is found that the successful reversible gain or loss of electrons by ionization is useful for controlling the stability and reactivity of M @ C-82 toward both nucleophiles and electrophiles.