Use of naphthalene as a solvent for selective formation of the 1:1 diels-alder adduct of C60 with anthracene

A reaction of C60 with an equimolar amount of anthracene in refluxing naphtlhalene gives the 1:1 Diels-Alder adduct in 67% yield based on consumed C60: the adduct was fully characterized by IR, UV-vis, 1H and 13C NMR, and MS spectroscopy, and exhibited reversible reduction waves at the potential 0.11 to 0.19 V more negative and an irreversible oxidation peak at the potential 0.11 V less positive than those of C60 itself.