Used as a catalyst or reagent in organic synthesis, particularly in alkylation reactions due to its strong alkylating properties. It serves as a methylating agent for nitrogen- and sulfur-containing compounds, enabling efficient transfer of the methyl group under mild conditions. Commonly applied in pharmaceutical synthesis where selective methylation is required. Its triflate anion enhances solubility in polar organic solvents, making it suitable for use in homogeneous reaction systems. Also employed in materials science for modifying heterocyclic compounds used in functional materials.