Photochemical reactions of C-60 with siliranes (1a-d) afford adducts of four types (2a-5b) as carbosilylated and hydrosilylated C-60 derivatives. Characterization of these adducts was conducted using MS, UV, NMR spectroscopy, and single-crystal X-ray analyses. In particular, the first example of the crystal structure of a closed 1,2-adduct at the 5,6-ring junction of the C-60 cage is provided by single-crystal X-ray analysis of 3b. Electrochemical analyses also revealed unique redox properties of the products 2b-5b, which depend on the regiochemistry of the functionality, in addition to the substituents on the C-60 cage. Theoretical calculations offer bases for the experimentally observed redox properties and relative stabilities of the silylated products.