Isobutylene

Isobutylene
Names
	Preferred IUPAC name 2-Methylprop-1-ene
	Other names 2-Methylpropene; Isobutene; γ-Butylene; 2-Methylpropylene; Methylpropene
Identifiers
CAS Number	115-11-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:43907 ;
ChemSpider	7957 ;
ECHA InfoCard	100.003.697
EC Number	204-066-3;
PubChem CID	8255;
RTECS number	UD0890000;
UNII	QA2LMR467H ;
UN number	1055; In Liquefied petroleum gas: 1075
CompTox Dashboard (EPA)	DTXSID9020748 ;
	InChI InChI=1S/C4H8/c1-4(2)3/h1H2,2-3H3 Key: VQTUBCCKSQIDNK-UHFFFAOYSA-N ; InChI=1/C4H8/c1-4(2)3/h1H2,2-3H3;
	SMILES CC(=C)C;
Properties
Chemical formula	C4H8
Molar mass	56.106 g/mol
Appearance	Colorless gas
Density	0.5879 g/cm3, liquid
Melting point	−140.3 °C (−220.5 °F; 132.8 K)
Boiling point	−6.9 °C (19.6 °F; 266.2 K)
Magnetic susceptibility (χ)	−44.4·10−6 cm3/mol
Structure
Point group	C2v
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H220
Precautionary statements	P210, P377, P381, P403
NFPA 704 (fire diamond)	1 4 0
Flash point	flammable gas
Autoignition; temperature	465 °C (869 °F; 738 K)
Explosive limits	1.8–9.6%
Related compounds
Related butenes	1-Butene; cis-2-Butene; trans-2-Butene
Related compounds	Isobutane
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Isobutylene (or 2-methylpropene) is a hydrocarbon with the chemical formula (CH₃)₂C=CH₂. It is a four-carbon branched alkene (olefin), one of the four isomers of butylene. It is a colorless flammable gas, and is of considerable industrial value.