Used as a highly effective arylating agent in organic synthesis, particularly for transferring mesityl and p-tolyl groups under mild conditions. It is commonly employed in transition-metal-free arylation reactions, enabling the formation of carbon–carbon and carbon–heteroatom bonds. Its stability and reactivity make it suitable for use in pharmaceutical synthesis, agrochemicals, and materials science, especially in the preparation of complex aromatic structures. The tetrafluoroborate salt enhances solubility in polar solvents and improves shelf life, making it practical for laboratory-scale reactions.