title: Formation of polychlorinated dibenzofurans in Ullman reaction.
mesh_terms: D000814:Aniline Compounds; D001572:Benzofurans / Q000032:analysis / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D002849:Chromatography, Gas; D007536:Isomerism; D013058:Mass Spectrometry
chemical_list: D000814:Aniline Compounds; D001572:Benzofurans