(R)-3-Ethylmorpholine hydrochloride is primarily used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of enantiomerically pure compounds. It serves as a key intermediate in the production of drugs that require specific stereochemistry for optimal biological activity. The compound is also employed in asymmetric synthesis, where it acts as a catalyst or ligand to induce chirality in target molecules. Additionally, it finds application in the preparation of agrochemicals and fine chemicals, where its stereochemical properties enhance the efficacy and selectivity of the final products. Its use in research and development further aids in the exploration of new therapeutic agents and chemical processes.