Diethyl Malonate

Cas Number


Other Names

Diethyl malonate

The formula



Diethyl malonate, also known as DEM, is the diethyl ester of malonic acid. It occurs naturally in grapes and strawberries as a colourless liquid with an apple-like odour, and is used in perfumes. It is also used to synthesize other compounds such as barbiturates, artificial flavourings, vitamin B1, and vitamin B6.

Physical and Chemical Properties
Physical state and appearance Coloueless or light coloured, transperarent liquid
Molecular Weight 132.12 g/mole
Color Clear Colorless
Boiling Point 180°C (356°F)
Flash point CLOSED CUP: 90°C (194°F)
Melting Point -62°C (-79.6°F)
Specific Gravity 1.156 (Water = 1)
Dispersion Properties See solubility in water.
Solubility Partially soluble in cold water
Assay 99.0% min
Moisture 0.10% max
Acidity 0.10% max

1. DEA is used as a surfactant and a corrosion inhibitor

2. It is used to remove hydrogen sulfide and carbon dioxide from natural gas

3. In oil refineries, a DEA in water solution is commonly used to remove hydrogen sulfide from various process gases

4. It has an advantage over a similar amine ethanolamine in that a higher concentration may be used for the same corrosion potential. This allows refiners to scrub hydrogen sulfide at a lower circulating amine rate with less overall energy usage

5. DEA is a versatile chemical intermediate, principal derivatives include ethyleneimine and ethylenediamine

6. Dehydration of DEA with sulfuric acid gives morpholine