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But-1-ene-2D-skeletal.png But-1-ene-3D-balls.png
CAS number 106-98-9 YesY
PubChem 7844
ChemSpider 7556 YesY
UNII LY001N554L YesY
ChEBI CHEBI:48362 YesY
Jmol-3D images Image 1
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Molecular 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
NFPA 704
Flammability code 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g., propane Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Autoignition temperature 385 °C (725 °F)
Explosive limits 1.6-10%
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

1-Butene is an organic chemical compound, linear alpha-olefin (alkene),[1] and one of the isomers of butene. The formula is C


1-Butene is stable in itself but polymerizes exothermically. It is highly flammable and readily forms explosive mixtures with air. It is, however, incompatible with metal salts, fluorine and other halogens, nitrogen oxides, boron trifluoride, hydrohalic acids, and strong oxidizing agents.


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. 1-butene is used to manufacture lots of other chemical products, such as linear low-density polyethylene (LLDPE), polypropylene resins, polybutene, butylene oxide, and butanone.[2]

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