Ethyl diazoacetate is widely used in organic synthesis as a versatile reagent for cyclopropanation reactions. It facilitates the formation of cyclopropane rings by reacting with alkenes, making it valuable in the production of complex organic molecules, including pharmaceuticals and natural products. Additionally, it serves as a carbene precursor, enabling the insertion of carbene groups into C-H, O-H, and N-H bonds, which is useful in modifying organic compounds. Its role in the synthesis of amino acids and peptides is also significant, particularly in the preparation of β-lactam antibiotics. In polymer chemistry, ethyl diazoacetate is employed to functionalize polymers, enhancing their properties for specific applications. Its reactivity and ability to form diverse structures make it a crucial tool in synthetic chemistry.