Fulvene

Fulvene (pentafulvene) is a hydrocarbon with the formula (CH=CH)₂C=CH₂. It is a prototype of a cross-conjugated hydrocarbon.^[2] Fulvene is rarely encountered,^[3] but substituted derivatives (fulvenes) are numerous. They are mainly of interest as ligands and precursors to ligands in organometallic chemistry.

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Fulvene

Names
Preferred IUPAC name 5-Methylidenecyclopenta-1,3-diene[1]
Other names Fulvene[1] 5-Methylene-1,3-cyclopentadiene
Identifiers
CAS Number	497-20-1 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:51999 Y
ChemSpider	120097 Y
PubChem CID	136323
UNII	19W699IKIE Y
CompTox Dashboard (EPA)	DTXSID30897602
InChI InChI=1S/C6H6/c1-6-4-2-3-5-6/h2-5H,1H2 Y Key: PGTKVMVZBBZCKQ-UHFFFAOYSA-N Y InChI=1/C6H6/c1-6-4-2-3-5-6/h2-5H,1H2 Key: PGTKVMVZBBZCKQ-UHFFFAOYAV
SMILES C=C1\C=C/C=C1
Properties
Chemical formula	C6H6
Molar mass	78.114 g·mol−1
Magnetic susceptibility (χ)	−42.9·10−6 cm3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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Fulvene is an isomer of benzene, which when irradiated at 237 to 254 nm forms small amounts of fulvene along with benzvalene.^[4]