Application of photo-aryl coupling reactions for the syntheses of triphenylene and dibenzo [fg, op] naphthacene was explored. Three types of reactions were developed: Photocyclodehydrogenation of polyphenyl compounds, photolytic reactions of iodoarenes, and photocyclodehydrohalogenation of halogenopolyaryls. The effects of solvent, oxidant, and wavelength on the photocyclization of o-terphenyl and 2, 2′-diphenylbiphenyl to the ...