4-Chlorobutylamine Hydrochloride is primarily used in organic synthesis as a versatile building block for the preparation of various pharmaceutical compounds. It serves as an intermediate in the synthesis of active pharmaceutical ingredients (APIs), particularly in the development of drugs targeting neurological disorders and cardiovascular diseases. Its reactive chlorobutyl group allows for further functionalization, making it valuable in creating complex molecules. Additionally, it is employed in the production of agrochemicals, where it contributes to the synthesis of herbicides and pesticides. In research, it is utilized for modifying peptides and other biomolecules, aiding in the study of biological processes and drug discovery. Its role in chemical synthesis highlights its importance in both industrial and academic settings.