Used primarily in industrial applications as an intermediate in the synthesis of polychlorinated biphenyl (PCB) mixtures, which were historically employed in electrical equipment such as transformers and capacitors due to their chemical stability and insulating properties. Also found as a byproduct or environmental contaminant in systems where PCBs were manufactured or used. Its presence is monitored in environmental and biological samples due to toxicity concerns and persistence in ecosystems. Limited current commercial use due to regulatory restrictions on PCB-related compounds.