:1-Butene

{{Chembox

|Verifiedfields = changed

|Watchedfields = changed

|verifiedrevid = 477207214

|ImageFileL1 = 1-Butene.svg

|ImageClassL1 = skin-invert

|ImageFileR1 =But-1-ene-3D-balls.png

|ImageClassR1 = bg-transparent

|ImageFile1 = 1-butene.svg

|ImageClass1 = skin-invert

|PIN = But-1-ene{{cite book | title = Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book) | publisher = The Royal Society of Chemistry | date = 2014 | location = Cambridge | pages = 17, 61, 374 | doi = 10.1039/9781849733069-FP001 | isbn = 978-0-85404-182-4}}

|OtherNames = Ethylethylene
1-Butylene
α-Butylene

|Section1 = {{Chembox Identifiers

|ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

|ChEBI_Ref = {{ebicite|correct|EBI}}

|ChEBI = 48362

|ChemSpiderID = 7556

|ChEMBL_Ref = {{ebicite|correct|EBI}}

|ChEMBL = 117210

|InChI = 1/C4H8/c1-3-4-2/h3H,1,4H2,2H3

|InChIKey = VXNZUUAINFGPBY-UHFFFAOYAZ

|SMILES1 = CCC=C

|StdInChI_Ref = {{stdinchicite|correct|chemspider}}

|StdInChI = 1S/C4H8/c1-3-4-2/h3H,1,4H2,2H3

|StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

|StdInChIKey = VXNZUUAINFGPBY-UHFFFAOYSA-N

|CASNo_Ref = {{cascite|correct|CAS}}

|CASNo = 106-98-9

|PubChem = 7844

|UNII_Ref = {{fdacite|correct|FDA}}

|UNII = LY001N554L

|UNNumber = 1012

|EC_number = 203-449-2

|Gmelin = 25205

|Beilstein = 1098262

|SMILES = C=CCC

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|Section2 = {{Chembox Properties

|C=4 | H=8

|Appearance = Colorless gas

|Odor = slightly aromatic

|Density = 0.62 g/cm³

|MeltingPtC = -185.3

|BoilingPtC = -6.47

|Solubility = 0.221 g/100 mL

|SolubleOther = soluble in alcohol, ether, benzene

|RefractIndex = 1.3962

|Viscosity = 7.76 Pa

}}

|Section3 = {{Chembox Hazards

|FlashPtF = −110

|AutoignitionPtC = 385

|ExploLimits = 1.6–10%

|NFPA-H = 1 | NFPA-F = 4 | NFPA-R = 0

|GHSPictograms = {{GHS02}}

|GHSSignalWord = Danger

|HPhrases = {{H-phrases|220}}

|PPhrases = {{P-phrases|210|377|381|403|410+403}}

}}

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1-Butene (IUPAC name: But-1-ene, also known as 1-butylene) is the organic compound with the formula CH₃CH₂CH=CH₂. It is a colorless gas, but easily condensed to give a colorless liquid. It is classified as a linear alpha-olefin (terminal alkene).{{cite web|url=http://chemicalland21.com/industrialchem/organic/1-BUTENE.htm|title=1-BUTENE|website=chemicalland21.com|access-date=22 April 2018}} It is one of the isomers of butene (butylene). It is a precursor to diverse products.