Used as a highly active catalyst in cross-coupling reactions, particularly in the formation of carbon–carbon and carbon–heteroatom bonds. It is especially effective in gold-catalyzed transformations such as alkyne functionalization, cyclization reactions, and C–H activation under mild conditions. The presence of the bulky di-tert-butylphosphine ligand enhances catalyst stability and reactivity, while the acetonitrile ligand allows for easy displacement to initiate catalysis. The hexafluoroantimonate counterion contributes to high solubility in polar organic solvents, making it suitable for use in homogeneous catalytic systems. Commonly employed in pharmaceutical and fine chemical synthesis where high selectivity and efficiency are required.