View source for Pentalene

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| ImageFile = Pentalene.svg
| ImageSize = 
| IUPACName = Pentalene
| OtherNames = 
| Section1 = {{Chembox Identifiers
|   CASNo = 250-25-9
|   PubChem = 5460726
|   SMILES = c1cc2cccc2c1
|   InChI = 1/C8H6/c1-3-7-5-2-6-8(7)4-1/h1-6H
|   ChEBI = 33074
  }}
| Section2 = {{Chembox Properties
|   Formula = C<sub>8</sub>H<sub>6</sub>
|   MolarMass = 102.13 g/mol
|   Appearance = 
|   Density = 
|   MeltingPt = 
|   BoilingPt = 
|   Solubility = 
  }}
| Section7 = {{Chembox Hazards
|   MainHazards = 
|   FlashPt = 
|   Autoignition = 
  }}
}}

'''Pentalene''' is a polycyclic [[hydrocarbon]] composed of two fused [[cyclopentadiene]] rings.  It has [[chemical formula]] C<sub>8</sub>H<sub>6</sub> and [[CAS number]] 250-25-9. It is [[antiaromaticity|antiaromatic]], because it has [[Hückel's rule|4n]] [[pi electron]]s. For this reason it [[dimer|dimerizes]] even at temperatures as low as -100°C <ref>Carey, Francis A.; Sundberg, Richard J.; (1984). ''Advanced Organic Chemistry Part A Structure and Mechanisms'' (2nd ed.). New York N.Y.: Plenum Press. ISBN 0-306-41198-9.</ref> <ref>{{cite journal | author = Bally T., Chai S., Neuenschwander M., Zhu Z. | date = 1997 | title = Pentalene: Formation, Electronic, and Vibrational Structure | journal = J. Am. Chem. Soc. | volume = 119 | issue = | pages = 1869-1875(7) | pmid = | doi = 10.1021/ja963439t | url = http://www-chem.unifr.ch/tb/bally/pdf/pentalene.pdf | accessdate = 2007-07-06 }}</ref>


== See also ==
* [[Benzocyclobutene]]

==References==
{{reflist|2}}

[[Category:Polycyclic nonaromatic hydrocarbons]]

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