1-(2-Chlorophenyl)piperazine hydrochloride is an organic compound featuring a piperazine ring substituted with a 2-chlorophenyl group, supplied as its hydrochloride salt. This white to off-white crystalline powder is a key building block in medicinal chemistry. Its primary and most significant application is as a versatile intermediate in the synthesis of various pharmacologically active compounds. It serves as a crucial precursor for a range of drugs, particularly those targeting the central nervous system. Notable examples include the synthesis of aripiprazole, an atypical antipsychotic, and trazodone, an antidepressant. The molecule's structure allows for further functionalization to create diverse libraries of bioactive molecules. As a substituted piperazine derivative, it is a common amine-containing synthon in organic synthesis. It is commercially available from numerous chemical suppliers for research and development purposes. Standard safety precautions for handling amines and hydrochloride salts should be observed.