D-Threonine Benzyl Ester Hydrochloride is primarily used in the field of organic synthesis, particularly in the production of peptides and amino acid derivatives. Its role as a protected form of threonine allows for selective reactions in peptide bond formation, ensuring the integrity of the amino acid during complex synthesis processes. This compound is also utilized in the development of pharmaceuticals, where it serves as a building block for drugs that require specific chiral configurations. Additionally, it finds application in biochemical research, aiding in the study of enzyme mechanisms and protein interactions due to its ability to mimic natural amino acids in controlled environments. Its stability and reactivity make it a valuable reagent in both industrial and academic laboratories.