A novel oxygen-bridged unsymmetrical dimer composed of C-60 cages with 1,2- and 1,4-configurations Is obtained. The dimer is interesting due to the existence of only one regioisomer, unique regioselectivity, presence of organo functionalities, and exhibition of stepwise reductions via the alternative sequential electron transfer to the 1,4- and 1,2-C-60 cages.