Used primarily as an intermediate in the synthesis of nonsteroidal anti-inflammatory drugs (NSAIDs), particularly naproxen. Its chiral structure allows for selective production of the active (S)-enantiomer, which exhibits potent anti-inflammatory, analgesic, and antipyretic effects. The acid chloride group enables efficient coupling reactions, making it valuable in pharmaceutical manufacturing for forming amide or ester bonds. Commonly employed in both batch and continuous flow synthesis to improve yield and enantiomeric purity. Also utilized in research settings for developing new derivatives with optimized pharmacokinetic profiles.