查看“︁2-丁烯”︁的源代码

{{Chembox
|ImageFileL1 = Cis-2-Buten.svg
|ImageCaptionL1 = ''cis''
|ImageFileR1 = Trans-2-Buten.svg
|ImageCaptionR1 = ''trans''
|ImageFileL2 = Cis-but-2-ene-3D-balls.png
|ImageCaptionL2 = ''cis''
|ImageFileR2 = Trans-but-2-ene-3D-balls.png
|ImageCaptionR2 = ''trans''
|PIN = But-2-ene
| Section1 = {{Chembox Identifiers
| InChI = 1/C4H8/c1-3-4-2/h3-4H,1-2H3
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/C4H8/c1-3-4-2/h3-4H,1-2H3
| InChIKey = IAQRGUVFOMOMEM-UHFFFAOYAW
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = IAQRGUVFOMOMEM-UHFFFAOYSA-N
| PubChem = 5287573
| PubChem_Comment =顺
| ChemSpiderID1_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID1 = 4449912
| ChemSpiderID1_Comment =（顺）
| SMILES = CC=CC
| PubChem1 = 62695
| PubChem1_Comment =反
| ChemSpiderID2_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID2 = 56442
| ChemSpiderID2_Comment =（反）
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 48363
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = S1SK37516R
| CASNo = 107-01-7
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo1 = 590-18-1
| CASNo1_Comment = 顺
| CASNo1_Ref = {{cascite|correct|CAS}}
| CASNo2 = 624-64-6
| CASNo2_Comment =反
| CASNo2_Ref = {{cascite|correct|CAS}}
| EC_number = 203-452-9
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 11719
| RTECS = EM2932000
}}
|Section2 = {{Chembox Properties
|C=4|H=8
|Density = 0.641 g/ml（顺，3.7 °C）<ref name=GESTIScis>{{GESTIS|ZVG=490242}}</ref><br>0.626 g/ml（反，0.9 °C）<ref name=GESTIStrans>{{GESTIS|ZVG=490266}}</ref>
|MeltingPt = {{convert|-138.9|C|K}}（顺）<ref name=GESTIScis/><br>{{convert|-105.5|C|K}}（反）<ref name=GESTIStrans/>
|BoilingPt ={{convert|3.7|C|K}}（顺）<ref name=GESTIScis/><br> {{convert|0.8|C|K}}（反）<ref name=GESTIStrans/>
|MagSus = {{Plainlist|
* -42.6·10<sup>−6</sup> cm<sup>3</sup>/mol（顺）
* -43.3·10<sup>−6</sup> cm<sup>3</sup>/mol （反）
}}
}}
|Section3 = {{Chembox Hazards
|Reference= <ref>{{ICSC-ref|03|97|name=''cis''-2-Butene|date=March 1996}}. {{ICSC-ref|03|98|name=''trans''-2-Butene|date=March 1996}}.</ref>
|GHSPictograms = {{GHS02|Flam. Gas 1}}{{GHS exclamation mark|Press. Gas}}
|GHSSignalWord = DANGER
|HPhrases = {{H-phrases|220}}
|PPhrases = {{P-phrases|210|377|381|403}}
|NFPA-H = 1
|NFPA-F = 4
|NFPA-R = 0
|FlashPt = {{convert|-72|C|K}}<ref name=GESTIScis/><ref name=GESTIStrans/>
|AutoignitionPt = 325
|AutoignitionPt_ref = <ref name=GESTIScis/><ref name=GESTIStrans/>
}}
}}

'''2-丁烯'''是一种[[烯烃]]，化学式[[C4H8|C<sub>4</sub>H<sub>8</sub>]]。它有[[顺反异构]]，是拥有此性质的最简单烯烃。因此，它具有两种[[异构体]]，分别是顺-2-丁烯与反-2-丁烯。

2-丁烯是[[石化产品]]，由[[石油]][[催化裂化]]或[[乙烯]][[二聚]]产生。它主要用于生产[[丁二烯]]。<ref name="SIDS">{{SIDS-ref|id=107017|name=2-Butene|date=February 1995}}.</ref>

2-丁烯的顺反异构体由于[[沸点]]相近（顺-2-丁烯~4&nbsp;°C；反-2-丁烯~1&nbsp;°C<ref>[http://www.inchem.org|InChem: Chemical Safety Information from Intergovernmental Organizations]  {{webarchive|url=https://web.archive.org/web/20091209074235/http://www.inchem.org/ |date=December 9, 2009 }}</ref>），难以通过[[蒸馏]]分离。不过，它们的化学性质相似，因此通常无需分离。工业上的2-丁烯混合物包括70%的顺-2-丁烯和30%的反-2-丁烯，以及少量的[[丁烷]]、[[1-丁烯]]、[[异丁烯]]、[[丁二烯]]、[[丁炔]]杂质。<ref name="SIDS"/>

==取得==
由[[第二丁基氯]]之[[去鹵化氫]]反應形成'''反-2-丁烯'''，副產物為[[氯離子]]和[[水分子]]
:<math>\ C_4H_9Cl + OH^- \to C_4H_8 + Cl^- + H_2O</math>

此反應仍會產生少量的[[1-丁烯]]和[[順-2-丁烯]]

==参考资料==
{{reflist}}

==外部链接==
*{{SIDS|id=107017|name=2-Butene|date=February 1995}}
{{Hydrocarbon-stub}}
{{烯烃}}
[[Category:烯烃]]