Cyclopentadienyl radical

Cyclopentadienyl radical
Names
	Preferred IUPAC name Cyclopenta-2,4-dien-1-yl
	Other names Cyclopentadienyl
Identifiers
CAS Number	2143-53-5;
3D model (JSmol)	Interactive image;
Beilstein Reference	2070324
ChEBI	CHEBI:36769;
ChemSpider	121110 ;
Gmelin Reference	323080
PubChem CID	137443;
CompTox Dashboard (EPA)	DTXSID00175702 ;
	InChI InChI=1S/C5H5/c1-2-4-5-3-1/h1-5H Key: HPYIUKIBUJFXII-UHFFFAOYSA-N ;
	SMILES [CH]1C=CC=C1;
Properties
Chemical formula	C5H5
Molar mass	65.095 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

In chemistry, cyclopentadienyl is a radical with the formula C₅H₅.

The related cyclopentadienyl anion (which can formally be converted to the cyclopentadienyl radical by one-electron reduction) is aromatic, and forms salts and coordination compounds.

^ ^a ^b Henri A. Favre; Warren H. Powell (2014). Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013. Cambridge, England: The Royal Society of Chemistry. p. 1052. doi:10.1039/9781849733069. ISBN 978-0-85404-182-4.

Names

Preferred IUPAC name Cyclopenta-2,4-dien-1-yl^[1]
Other names Cyclopentadienyl^[1]
Identifiers
CAS Number	2143-53-5
3D model (JSmol)	Interactive image
Beilstein Reference	2070324
ChEBI	CHEBI:36769
ChemSpider	121110^Y
Gmelin Reference	323080
PubChem CID	137443
CompTox Dashboard (EPA)	DTXSID00175702
InChI InChI=1S/C5H5/c1-2-4-5-3-1/h1-5H^Y Key: HPYIUKIBUJFXII-UHFFFAOYSA-N^Y
SMILES [CH]1C=CC=C1
Properties
Chemical formula	C₅H₅
Molar mass	65.095 g·mol⁻¹
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references