Regioselective Eightfold and Tenfold Additions of a Pyridine‐Modified Organocopper Reagent to [60]Fullerene

The amount of pyridine (py) is essential for the outcome of the efficient addition of aryl copper compounds to [60]fullerene on a 20-mg to 1-g scale (see scheme). It controls—in addition to the installation of an ortho-methyl group on the aryl reagent—the regioselectivity and the number of aryl groups introduced. The tenfold-addition adduct may be further converted into the corresponding double-decker metallocene.