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Synthesis of biarenes via a) photogenerated triplet aryl cations and aryl radicals (PC = photocatalyst), b) intramolecular free radical ipso substitution, c) thermally catalyzed extrusion of CO and SO2, d) photoinduced photoextrusion from benzene sulfonamides I and phosphonates II, and e) photoextrusion from diaryl- (III) and triaryl (IV) phosphates.
