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 ;
ECHA InfoCard	100.003.137
EC Number	203-449-2;
Gmelin Reference	25205
PubChem CID	7844;
UNII	LY001N554L ;
UN number	1012
CompTox Dashboard (EPA)	DTXSID1026746 ;
	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 labelling:
Pictograms
Signal word	Danger
Hazard statements	H220, H221, H280
Precautionary statements	P210, P377, P381, P403, P410+P403
NFPA 704 (fire diamond)	1 4 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). verify (what is ?) Infobox references

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

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