Used as a catalyst in organic synthesis, particularly in acid-catalyzed reactions such as esterification, ether formation, and condensation reactions. Its bulky sulfonic acid structure provides high acidity with low nucleophilicity, making it effective in promoting reactions without unwanted side products. Commonly employed in polymer chemistry and petrochemical processing due to its thermal stability and ability to function in non-aqueous environments. Also utilized as a proton source in specialty industrial applications where strong, controlled acidity is required.