Chemistry:1-Butene

1-Butene
Names
	Preferred IUPAC name But-1-ene
	Other names Ethylethylene; 1-Butylene; α-Butylene
Identifiers
CAS Number	106-98-9 ;
3D model (JSmol)	Interactive image; Interactive image;
Beilstein Reference	1098262
ChEBI	CHEBI:48362 ;
ChEMBL	ChEMBL117210 ;
ChemSpider	7556 ;
EC Number	203-449-2;
Gmelin Reference	25205
PubChem CID	7844;
UNII	LY001N554L ;
UN number	1012
	InChI InChI=1S/C4H8/c1-3-4-2/h3H,1,4H2,2H3 Key: VXNZUUAINFGPBY-UHFFFAOYSA-N ; 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	56.108 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
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H220, H221, H280
GHS precautionary statements	P210, P377, P381, P403, P410+403
NFPA 704 (fire diamond)	4 1 0
Flash point	−79 °C; −110 °F; 194 K
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).
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	Infobox references

But-1-ene (or 1-butylene) is the organic compound with the formula CH₃CH₂CH=CH₂. It is a colorless But-1-ene is an alkene easily condensed to give a colorless liquid. It is classified as a linear alpha-olefin (terminal alkene).^[2] It is one of the isomers of butene (butylene). It is a precursor to diverse products.

Reactions

Polymerization of but-1-ene gives polybutylene, But-1-ene has 4 carbon atoms. which is used to make piping for domestic plumbing.^[3] Another application is as a comonomer in the production of certain kinds of polyethylene, such as linear low-density polyethylene (LLDPE).^[4] It has also been used as a precursor to polypropylene resins, butylene oxide, and butanone.^[5]

Manufacturing

But-1-ene is produced by separation from crude C₄ refinery streams and by ethylene dimerization. The former affords a mixture of 1-and 2-butenes, while the latter affords only the terminal alkene.^[6] It is distilled to give a very high purity product. An estimated 12 billion kilograms were produced in 2011.^[7]