Abstract: Cathodic electrochemistry was performed for two methanofullerene derivatives, 3 and 4. Since it was possible to isolate the [6, 6] closed isomeric forms of these derivatives (called simply methanofullerenes), the electrochemistry of the pure isomers was recorded. The electrochemical behavior of the corresponding mixtures, which also contained the [5, 6] open forms (simply referred to as methanofulleroids), was also obtained. In the solvent ...