An efficient palladium-catalyzed reaction of [60]fullerene with benzoic acids via carboxylic acid group-directed C–H bond activation is achieved. The obtained [60]fullerene-fused lactones can undergo a retro Baeyer–Villiger reaction to provide [60]fullerene-fused ketones via apparent reduction in the presence of triflic acid. A representative ketone product obtained by the reduction reaction can be employed as an overcoating layer for the electron-transporting layer in an n-type perovskite solar cell.
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Niu et al. (2024) studied this question.
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