The copper(II) acetate monohydrate- or manganese(III) acetate dihydrate-mediated reaction of [60]fullerene with β-keto esters 1a–1c or with β-diketones 1d,1e in the presence of 4-dimethylaminopyridine afforded only dihydrofuran-fused C₆₀ derivatives 2a–2e. However, aromatic methyl ketones 3a–3c gave two kinds of products: methanofullerenes 4a–4c and dihydrofuran-fused C₆₀ derivatives 5a,5b. Possible reaction mechanisms are proposed.