1-butene

1-Butene

Names
Preferred IUPAC name But-1-ene
Other names Ethylethylene 1-Butylene α-Butylene
Identifiers
CAS Number	106-98-9 Y
3D model (Jmol)	Interactive image Interactive image
ChEBI	CHEBI:48362 Y
ChEMBL	ChEMBL117210 Y
ChemSpider	7556 Y
ECHA InfoCard	100.003.137
PubChem	7844
UNII	LY001N554L Y
InChI InChI=1S/C4H8/c1-3-4-2/h3H,1,4H2,2H3 Y Key: VXNZUUAINFGPBY-UHFFFAOYSA-N Y InChI=1/C4H8/c1-3-4-2/h3H,1,4H2,2H3 Key: VXNZUUAINFGPBY-UHFFFAOYAZ
SMILES C=CCC CCC=C
Properties
Chemical formula	C4H8
Molar mass	56.11 g·mol−1
Appearance	Colorless Gas
Odor	slightly aromatic
Density	0.62 g/cm3
Melting point	−185.3 °C (−301.5 °F; 87.8 K)
Boiling point	−6.47 °C (20.35 °F; 266.68 K)
Solubility in water	0.221 g/100 mL
Solubility	soluble in alcohol, ether, benzene
Refractive index (nD)	1.3962
Viscosity	7.76 Pa
Hazards
NFPA 704	4 1 0
Autoignition temperature	385 °C (725 °F; 658 K)
Explosive limits	1.6-10%
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

1-Butene is an organic chemical compound, linear alpha-olefin (alkene), and one of the isomers of butene. The formula is CH₃CH₂CH=CH₂. It is a highly flammable, easily condensed gas.

1-Butene is stable in itself but polymerizes readily to polybutene. Its main application is as a comonomer in the production of certain kinds of polyethylene, such as linear low-density polyethylene (LLDPE). It has also been used as a precursor to polypropylene resins, butylene oxide, and butanone.

1-Butene is produced either by separation from crude C₄ refinery streams or from the dimerization of ethylene. It is distilled to give a very high-purity product. An estimated 12 billion kilograms were produced in 2011, usually as a mixture with isomeric butenes.