| IUPAC name
| Other names
|Molar mass||56.06 g/mol|
|Appearance||Colorless to yellowish liquid|
|Odor||Acrid, burnt fat-like|
|Melting point||−88 °C (−126 °F; 185 K)|
|Boiling point||53 °C (127 °F; 326 K)|
|20 g/100 ml (20 °C)|
|Solubility|| Miscible in acetone, benzene, diethyl ether, ethanol, methylcyclohexane|
Slightly soluble in chloroform
|Vapor pressure||210 mmHg|
Std enthalpy of
|Safety data sheet||Sigma-Aldrich|
|Flash point||−26 °C|
|Lethal dose or concentration (LD, LC):|
LC50 (Median concentration)
| 875 ppm (mouse, 1 min)|
175 ppm (mouse, 10 min)
150 ppm (dog, 30 min)
8 ppm (rat, 4 hr)
375 ppm (rat, 10 min)
25.4 ppm (hamster, 4 hr)
131 ppm (rat, 30 min)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Acrolein or propenal (C3H4O) is the simplest unsaturated aldehyde. It is a colourless liquid with a piercing, disagreeable, acrid smell reminiscent of burnt fat.
Acrolein will polymerize in contact with light or a strong base.
Acrolein is a colorless to slight yellowish liquid, with a strong unpleasant odor, reminiscent of burnt fat.
While some chemical suppliers will sell acrolein, it is extremely difficult to get hold of.
Oxidation of propene will also give acrolein.
Acrolein is highly toxic and irritant. Wear proper protection and work in a well ventilated place or in a fumehood. Normal respirators do not block it, so you'll have to use a different type of breathing mask.
Acrolein should be stored in amber bottles, away from light or bases. Hydroquinone is added as a stabilizer. However, it should be noted that acrolein will polymerize in several days.
Acrolein can be neutralized with a base, such as sodium hydroxide.