In an 1-L round bottom flask, fullerene (0.85 g, 1.2 mmol), 9,10-dimethylancethracene (2.62 g, 13 mmol, 11 equivalents) and toluene (500 mL) were added. The resulting solution was stirred for 1 h to completely dissolve the fullerene. Carbon tetrabromide (4.78 g, 13 mmol, 11 equivalents) and t-butoxycarbonyl malonate (6.6 g, 13 mmol, 11 equivalents) were added to the solution. DBU (8.3 mL, 53.2 mmol) was added dropwise and the resulting mixture was stirred at room temperature overnight and the initial purple solution had become a dark red color. The crude mixture was poured though a silica gel plug in a sintered glass funnel and rinsed with toluene to remove unreacted fullerene. After that, the plug was rinsed with dichloromethane:ethyl acetate:methanol () to remove the red/brown band containing the crude products. The filtrate was evaporated and the resulting residue was purified via flash column chromatography with dichloromethane:ethyl acetate:methanol as eluent. (t-butoxycarbonyl malonate)-methano-Fullerene (1.8 g, dark red/brown oil) was obtained. The oil was dissolved in methylene chloride at a concentration of and processed by semi-preparative size exclusion chromatography (Phenogel SEC , 5 μm particle size, eluent: methylene chloride, ). The material corresponding to 1000 to 3000 AMU was collected and the solvent was evaporated to obtain a red oil. This material was characterized by MALDI MS.