Addition of diprotic nucleophiles to a C60–tetrazine monoadduct: structural reassignment and correction of a novel rearrangement

C60–tetrazine Diels–Alder adducts bearing electron deficient dihydropyridazine groups undergo chemoselective amination and hydration reactions upon addition of primary aliphatic amines and water, respectively, to form new adducts with 4,5-dihydropyrazole groups nested atop the [60]fullerene skeleton.