Used as a highly efficient arylating agent in organic synthesis, particularly in transition-metal-free arylation reactions. It serves as a source of aryl cations, enabling the transfer of the biphenyl-4-yl group to various nucleophilic substrates. Commonly applied in the functionalization of arenes, heteroarenes, and enolates under mild conditions. Its stability and reactivity make it valuable in pharmaceutical and agrochemical research for constructing biaryl motifs and complex aromatic systems. Also employed in photo-induced reactions where it acts as a photoinitiator or aryl radical precursor upon irradiation.