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Skeletal formula of methacrolein Ball-and-stick model of methacrolein
CAS number 78-85-3 YesY
PubChem 6562
ChemSpider 6314 YesY
Jmol-3D images Image 1
Molecular formula C4H6O
Molar mass 70.09 g/mol
Density 0.847 g/cm3
Melting point −81 °C (−114 °F; 192 K)
Boiling point 69 °C (156 °F; 342 K)
Related compounds
Related alkenals Citral


Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Methacrolein, or methacrylaldehyde, is an unsaturated aldehyde. It is a clear, colorless, flammable liquid.

Methacrolein is one of two major products resulting from the reaction of isoprene with OH in the atmosphere, the other product being Methyl vinyl ketone (MVK, also known as butenone).[1] These compounds are important components of the atmospheric oxidation chemistry of biogenic chemicals, which can result in the formation of ozone and/or particulates.

It is present in cigarette smoke.[2]

Industrially, the primary use of methacrolein is in the manufacture of polymers and synthetic resins.

Exposure to methacrolein is highly irritating to the eyes, nose, throat and lungs.

The essential oil of the plant Big Sagebrush (Artemisia tridentata) contains 5% methacrolein.[3]

See also[edit]


  1. ^ Montzka, S. A., M. Trainer, P. D. Goldan, W. C. Kuster, and F. C. Fehsenfeld (1993), Isoprene and its oxidation products, methyl vinyl ketone and methacrolein, in the rural troposphere, J. Geophys. Res., 98(D1), 1101–1111, doi:10.1029/92JD02382.
  2. ^ Roy J. Shephard (1982). "The risks of passive smoking". Google Books Search. Retrieved 2009-05-06. 
  3. ^ Shakhnoza, Azimova S. et al. (2012). Lipids, Lipophilic Components and Essential Oils from Plant Sources. Springer. p. 844. ISBN 9780857293237. 

External links[edit]