4,4,5,5-Tetramethyl-2-(2,3,4,5-tetrachlorophenyl)-1,3,2-dioxaborolane is an intermediate in the synthesis of 2,2',3,4,4',5,5'-Heptachlorobiphenyl (H265060). 2,2',3,4,4',5,5'-Heptachlorobiphenyl is a polychlorinated biphenyl (PCB) found in air, soil, mammals, and marine animals.