Cyclopentenone

Cyclopentenone
Names
	Preferred IUPAC name Cyclopent-2-en-1-one
Identifiers
CAS Number	930-30-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:141550;
ChEMBL	ChEMBL52190 ;
ChemSpider	12999 ;
ECHA InfoCard	100.012.012
PubChem CID	13588;
UNII	Q0U2IGF9CK ;
CompTox Dashboard (EPA)	DTXSID60870802 ;
	InChI InChI=1S/C5H6O/c6-5-3-1-2-4-5/h1,3H,2,4H2 Key: BZKFMUIJRXWWQK-UHFFFAOYSA-N ;
	SMILES C1CC(=O)C=C1;
Properties
Chemical formula	C5H6O
Molar mass	82.102 g·mol−1
Density	0.98 g·mL−1
Boiling point	150 °C (302 °F; 423 K)
Solubility in water	almost insoluble in water
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Harmful
Flash point	42 °C (108 °F; 315 K)
	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

2-Cyclopentenone is the organic compound with the chemical formula (CH₂)₂(CH)₂CO. 2-Cyclopentenone contains two functional groups, a ketone and an alkene. It is a colorless liquid. Its isomer, 3-cyclopentenone is less commonly encountered.

The term cyclopentenone may also refer to a structural motif wherein the cyclopentenone moiety is a subunit of a larger molecule. Cyclopentenones are found in a large number of natural products, including jasmone, the aflatoxins, and several prostaglandins.