(S)-1-(3-Fluorophenyl)ethan-1-amine hydrochloride is a chiral amine derivative featuring a 3-fluorophenyl substituent. It is a white to off-white crystalline powder. The compound is characterized by its specific optical rotation and high enantiomeric purity, making it a valuable chiral building block. This compound is primarily utilized as a key chiral intermediate in pharmaceutical research and development. Its structure, combining a chiral center with a fluorinated aromatic ring, is particularly relevant for the synthesis of active pharmaceutical ingredients (APIs) targeting the central nervous system (CNS) and other therapeutic areas where fluorination is used to modulate pharmacokinetic properties. The (S)-enantiomer is often specifically required for biological activity. As a chiral amine, it serves as a versatile synthon in asymmetric synthesis and medicinal chemistry. It is commonly employed in the preparation of amides, sulfonamides, and other derivatives. Handling requires standard precautions for amine hydrochlorides, including protection from moisture.