查看“︁丙二烯”︁的源代码

{{Chembox
|   Name = 丙二烯
|   ImageFile = Propadiene structure.svg
|   ImageSize = 200px
|   ImageName = 1,2-丙二烯的结构式
|   ImageFile1 = Allene3D.png
|   ImageSize1 = 150px
|   IUPACName = 1,2-丙二烯
| Section1 = {{Chembox Identifiers
|  CASNo = 463-49-0
|   CASNo_Ref = {{cascite|correct|CAS}}
|  PubChem = 10037
|   PubChem_Ref = {{Pubchemcite|correct|PubChem}}
|  ChemSpiderID = 9642
|   ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
|  EINECS = 207-335-3
|  UNNumber = 2200
|  MeSHName = Propadiene
|  ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 37601
|  ChEMBL = 116960
|   ChEMBL_Ref = {{ebicite|correct|EBI}}
|  Beilstein = 1730774
|  Gmelin = 860
|  SMILES = C=C=C
|  SMILES1 = C(=C)=C
|  StdInChI = 1S/C3H4/c1-3-2/h1-2H2
|   StdInChI_Ref = {{stdinchicite|correct|chemspider}}
|  StdInChIKey = IYABWNGZIDDRAK-UHFFFAOYSA-N
|   StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
}}
| Section2 = {{Chembox Properties
|  MeltingPtC = -136
|  BoilingPtC = -34
|  LogP = 1.45}}
| Section3 = {{Chembox Properties
|   Formula = C<sub>3</sub>H<sub>4</sub>
|   MolarMass = 40.031300128
|   Appearance = 無色氣體
|   MeltingPt = -136&nbsp;°C
|   BoilingPt = -34&nbsp;°C
  }}
}}

'''丙二烯'''是一种[[有机化合物]]，结构简式为H<sub>2</sub>C=C=CH<sub>2</sub>。它是最常见的[[累积二烯烃]]，有连续的两个碳碳[[双键]]。常温常压下为无色气体，略带甜味，与丙炔之间存在互变异构，且平衡常数很大，是重要的基础有机化学原料。

== 与丙炔的互变异构 ==

丙二烯的累积二烯烃结构不稳定，会发生分子内氢转移变为[[丙炔]]：

:<chem>H3CC#CH <<=> H2C=C=CH2</chem>

其平衡常数{{nowrap|1=''K''{{sub|eq}} = 0.22}}为 0.22（270℃）或 0.1（5℃）

其与丙炔的[[混合物]]称为{{le|曼普气|MAPP gas}}（MAPP gas），是一种常用的[[工业燃气]]，常被用在[[焊接]]上。

== 参考资料 ==
* [http://dx.doi.org/10.1002%2F14356007.m22_m01 WILEY ONLINE LIBRARY]
* [http://goldbook.iupac.org/A00238.html IUPAC GOLD BOOK]{{Wayback|url=http://goldbook.iupac.org/A00238.html |date=20110707185740 }}

{{有机化合物小作品}}

{{烯烃}}

[[Category:二烯烃]]
[[Category:三碳有机物]]