Ethyl malonate is a dicarboxylic acid.

Diethyl malonate is an organic synthesis intermediate, mainly used as an intermediate for pharmaceuticals such as long-acting sulfonamides and barbiturates. It is also an important intermediate for the preparation of 2-amino-4,6-dimethoxypyrimidine, as well as an intermediate for fragrances and dyes.It is used to formulate fruit flavors such as pear, apple, grape and cherry. It is used as a solvent and plasticizer for resins and nitrocellulose, and in organic synthesis.