Ring-opening reaction of tetrahydrofuran takes place on penta(methyl)- and penta(n-butylphenyl)[60]fullerenes in the presence of chlorotrimethylsilane giving penta(organo)fullerene hydroxybutyl derivatives, C 60 R 5 (C 4 H 8 OH) (R=Me, n BuC 6 H 4 ). The hydroxyl groups were further transformed into methacrylate and norbornylcarbonyloxy groups via esterification with the corresponding acid chlorides. The methacrylate derivative, penta(methyl)[60]fullerenylbutyl methacrylates was crystallographically characterized.