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Topic summary

Isobutylene

Isobutylene
Names Preferred IUPAC name
2-Methylprop-1-ene
Other names
2-Methylpropene
Isobutene
γ-Butylene
2-Methylpropylene
Methylpropene
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard100.003.697EC Number
  • 204-066-3
RTECS number
  • UD0890000
UNII
UN number1055
In Liquefied petroleum gas: 1075
  • InChI=1S/C4H8/c1-4(2)3/h1H2,2-3H3
    Key: VQTUBCCKSQIDNK-UHFFFAOYSA-N
  • InChI=1/C4H8/c1-4(2)3/h1H2,2-3H3
  • CC(=C)C
Properties C4H8Molar mass56.108 g·mol Appearance Colorless gas Density0.5879 g/cm, liquid Melting point−140.3 °C (−220.5 °F; 132.8 K) Boiling point−6.9 °C (19.6 °F; 266.2 K) −44.4·10 cm/mol Structure C2vHazards GHS labelling: DangerH220P210, P377, P381, P403NFPA 704 (fire diamond)
1
4
0
Flash pointflammable gas 465 °C (869 °F; 738 K) Explosive limits1.8–9.6% 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).
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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.

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