The Diels-Alder reaction of o-quinodimethanes to buckminsterfullerene c60 (1) affords thermally stable derivatives. 4-Carboxy-o-quinodimethane (4) was prepared in situ from 3, 4- bis (bromomethyl)-benzoic acid (3) and reacted with 1 to give the carboxy-substituted adduct mixture 5 (n). Due to its decreased solubility, 5 (n) was used without further purification for transformations into the corresponding esters and amines. This was achieved by two ...
