The structure and synthesis of three additional components of the technical polychlorinated biphenyl product Phenochlor-DP6 (11096825) were described. The strong absorption of Phenochlor at 813/centimeter in the IR spectrum suggested that additional products with a 1,2,3,4 substitution pattern in the benzene nuclei could be present among the unidentified peaks. These products were identified as 2,2',3,3',6,6'-hexachlorobiphenyl, 2,2',3,4',5',6-hexachlorobiphenyl, and 2,2',3,3',4,5,6'-heptachlorobiphenyl. Syntheses of these compounds was performed by the Ullman reaction. Identification of the reaction products was established by infrared spectra and by the retention times on three different gas liquid chromatography columns. The nuclear magnetic resonance spectra of the synthetic products provided additional proof of their exact structure.
