Used primarily as an acylating agent in organic synthesis, especially in the production of esters and amides. Commonly applied in the manufacture of surfactants, lubricants, and emulsifiers for cosmetics and personal care products. Plays a role in modifying the surface properties of nanoparticles and in the synthesis of long-chain fatty acid derivatives. Also utilized in pharmaceutical intermediates where controlled acylation is required. Reacts vigorously with water and alcohols, making it suitable for reactions under anhydrous conditions.