(1R)-1-Cyclopropylethan-1-amine hydrochloride is a chiral amine salt, specifically the hydrochloride salt of (1R)-1-cyclopropylethylamine. It is a white to off-white crystalline powder. The compound features a cyclopropyl group attached to a chiral carbon bearing an amino group, making it a valuable chiral building block. This compound is primarily used as a key chiral intermediate in the pharmaceutical industry. It is notably employed in the synthesis of various active pharmaceutical ingredients (APIs). Its structural motif, combining a cyclopropyl ring with a chiral amine, is significant for imparting specific biological activity and metabolic stability to drug molecules. It serves as a crucial precursor in multi-step synthetic routes. As a chiral amine, it is also a versatile synthon in organic chemistry for constructing complex molecules. Handling requires standard precautions for amine hydrochlorides, including avoiding inhalation and contact with skin or eyes.