Covalent linking of C60 to electron donors is expected to create attractive substrates for the study of electron or energy transfer. The successful synthesis of a 4,5-dimethoxy-o-quinodimethane-C60 adduct is described. The unique crystal structure has been determined and the bandgap measured by ESCA. One of the most interesting features of the crystal structure of the mono-adduct is the close contact of one of the methoxy groups to a neighboring C60, leading to the formation of a chain of interacting fullerene cages.