Solvent‐Free Reactions of Fullerenes with Diethyl Bromomalonate in the Presence of Inorganic Bases Under High‐Speed Vibration Milling Conditions

Solvent-free reactions of C-60 and C-70 with diethyl bromomalonate in the presence of various inorganic bases were investigated under the high-speed vibration milling (HSVM) conditions, and are shown to give methanofullerenes1 and 2 in good to excellent yields based on consumed fullerenes. Several weak inorganic bases were found to be quite effective in promoting the solvent-free mechanochemical Bingel reactions of C-60 and C-70 under the HSVM conditions. Among the studied bases, sodium acetate gave the highest yield of monoadducts, while potassium carbonate afforded a considerable amount of bisadducts for both C-60 and C-70.