A visible-light-induced
metal-free synthesis of 1,4-dicarbonyl
compounds from alkyne-containing aryl iodides via photochemical C–I
bond cleavage, intramolecular cyclization, oxidation, and intermolecular
radical coupling sequence is reported. TEMPO was employed as the oxygen
atom donor in this transformation. This protocol provided a new strategy
for the synthesis of 1,4-dicarbonyl bifluorene compounds.