Synthesis of [70]fullerene-fused lactones improved organic photovoltaic efficiency to 18.27%, highlighting new pathways.
Syntheses of [70]fullerene-fused lactones via palladium-catalysed annulation and 1,4-dipolar cycloaddition with complementary regioselectivities were achieved. Efficient retro Baeyer-Villiger reaction via electroreduction and trifluoromethanesulfonic anhydride treatment afforded [70]fullerene-fused ketones. Control experiments and theoretical calculations elucidated plausible reaction pathways. Representative products improved the organic photovoltaic efficiency to 18.27%.
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Qiu et al. (2025) studied this question.
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