Synthesis of methano[60]fullerene derivatives: the fluoride ion-mediated reaction of [60]fullerene with silylated nucleophiles

A new reaction of [60]fullerene with silylated nucleophiles is described. The cyclopropanation of [60]fullerene with silylated nucleophiles, such as silyl ketene acetals, silyl ketene thioacetals, and silyl enol ethers, derived from α-halo carbonyl compounds, smoothly proceeded in the presence of KF/18-crown-6 to give the corresponding methano[60]fullerene derivatives in moderate to good yields.