Fulvalene

Fulvalene
Names
	Preferred IUPAC name [1,1′-Bi(cyclopentylidene)]-2,2′,4,4′-tetraene
	Other names Bicyclopentyliden-2,4,2′,4′-tetraene ; 1,1′-Bi[cyclopentadienylidene] ; Pentafulvalene ; Bicyclopentadienylidene ; [5,5′]Bicyclopentadienylidene
Identifiers
CAS Number	91-12-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:51994 ;
ChemSpider	9083553 ;
PubChem CID	10908294;
UNII	V2K3QQS6YW ;
CompTox Dashboard (EPA)	DTXSID10447902 ;
	InChI InChI=1S/C10H8/c1-2-6-9(5-1)10-7-3-4-8-10/h1-8H Key: XEOSBIMHSUFHQH-UHFFFAOYSA-N ; InChI=1/C10H8/c1-2-6-9(5-1)10-7-3-4-8-10/h1-8H Key: XEOSBIMHSUFHQH-UHFFFAOYAP;
	SMILES C=1\C=C/C(/C=1)=C2\C=C/C=C2;
Properties
Chemical formula	C10H8
Molar mass	128.174 g·mol−1
Density	1.129 g/ml
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Fulvalene (bicyclopentadienylidene) is the member of the fulvalene family with the molecular formula C₁₀H₈. It is of theoretical interest as one of the simplest non-benzenoid conjugated hydrocarbons. Fulvalene is an unstable isomer of the more common benzenoid aromatic compounds naphthalene and azulene. Fulvalene consists of two 5-membered rings, each with two double bonds, joined by yet a fifth double bond. It has D_2h symmetry.