Methacrolein

Methacrolein

Names
IUPAC name 2-Methylprop-2-enal
Other names Methacrolein Methacrylaldehyde Isobutenal
Identifiers
CAS Number	78-85-3 Y
3D model (Jmol)	Interactive image
ChemSpider	6314 Y
ECHA InfoCard	100.001.046
PubChem CID	6562
InChI InChI=1S/C4H6O/c1-4(2)3-5/h3H,1H2,2H3 Y Key: STNJBCKSHOAVAJ-UHFFFAOYSA-N Y InChI=1/C4H6O/c1-4(2)3-5/h3H,1H2,2H3 Key: STNJBCKSHOAVAJ-UHFFFAOYAU
SMILES O=CC(=C)C
Properties
Chemical 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 Citronellal trans-2-Methyl-2-butenal
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Citronellal
trans-2-Methyl-2-butenal

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). 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.

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.