Cluster opening of [2-Cp-9-\'BuNH-closo-2,1,7,9-FeC3B8H10] (1) (Cp = eta(5) -C5H5-), followed by oxidation, generates complexes [2-Cp-8-\'BuNH-closo-2,1,8,10-FeC3B8H10] (2)