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a) Bioactive cyclobutanes. b) Photoredox‐catalyzed decarboxylative radical addition–polar cyclization cascades. c) Boronate complexes as alkyl radical precursors. Reduction potentials are versus SCE in MeCN. EWG=electron‐withdrawing group; PC=photocatalyst; SET=single‐electron transfer; PMP=4‐methoxyphenyl.
