{{Unreferenced|date=May 2026}} {{Chembox | Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 424687672 | ImageFile = Isoindene.png | ImageClass = skin-invert-image | ImageSize = 150px | ImageName = Skeletal formula | ImageFile1 = Isoindene-3D-balls.png | ImageName1 = Ball-and-stick model | PIN = 2''H''-Indene | OtherNames = 2''H''-Isoindene |Section1={{Chembox Identifiers | CASNo_Ref = {{cascite|correct|??}} | CASNo = 270-53-1 | UNII_Ref = {{fdacite|correct|FDA}} | UNII = QF4FM9ZP7E | SMILES = C12=CCC=C1C=CC=C2 | PubChem = 444084 | ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}} | ChemSpiderID = 392097 | InChI = 1/C9H8/c1-2-5-9-7-3-6-8(9)4-1/h1-2,4-7H,3H2 | InChIKey = BQTJMKIHKULPCZ-UHFFFAOYAS | StdInChI_Ref = {{stdinchicite|changed|chemspider}} | StdInChI = 1S/C9H8/c1-2-5-9-7-3-6-8(9)4-1/h1-2,4-7H,3H2 | StdInChIKey_Ref = {{stdinchicite|changed|chemspider}} | StdInChIKey = BQTJMKIHKULPCZ-UHFFFAOYSA-N | RTECS = | MeSHName = | ChEBI_Ref = {{ebicite|changed|EBI}} | ChEBI = 33054 }} |Section2={{Chembox Properties | C=9 | H=8 | Appearance = | Density = | MeltingPt = | BoilingPt = | Solubility = }} |Section3={{Chembox Hazards | MainHazards = | FlashPt = | AutoignitionPt = }} }}
'''Isoindene''' is a flammable polycyclic hydrocarbon with chemical formula C<sub>9</sub>H<sub>8</sub>. It is composed of a cyclohexadiene ring fused with a cyclopentadiene ring.
== See also == * Indene * Isoindole * Isoindenone
Category:Polycyclic nonaromatic hydrocarbons
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