3-Penten-2-one

3-Penten-2-one
Names
	Preferred IUPAC name Pent-3-en-2-one
	Other names Ethylidene acetone
Identifiers
CAS Number	625-33-2 (unspecified) ; 3102-33-8 (E) ; 3102-32-7 (Z) ;
3D model (JSmol)	(E): Interactive image; (Z): Interactive image;
Beilstein Reference	3-01-00-02985
ChemSpider	11747 (unspecified); 553493 (E); 4512214 (Z);
ECHA InfoCard	100.009.899
EC Number	210-888-3;
PubChem CID	12248 (unspecified); 637920 (E); 5356572 (Z);
UNII	4WN5NGB7KX (E) ; W8XX21WHYC (Z) ;
CompTox Dashboard (EPA)	DTXSID0060800 ;
	InChI (unspecified): InChI=1S/C5H8O/c1-3-4-5(2)6/h3-4H,1-2H3 Key: LABTWGUMFABVFG-UHFFFAOYSA-N; (E): InChI=1S/C5H8O/c1-3-4-5(2)6/h3-4H,1-2H3/b4-3+ Key: LABTWGUMFABVFG-ONEGZZNKSA-N; (Z): InChI=1S/C5H8O/c1-3-4-5(2)6/h3-4H,1-2H3/b4-3- Key: LABTWGUMFABVFG-ARJAWSKDSA-N;
	SMILES (unspecified): CC=CC(=O)C; (E): C/C=C/C(=O)C; (Z): C/C=C\C(=O)C;
Properties
Chemical formula	C5H8O
Molar mass	84.118 g·mol−1
Appearance	colourless liquid
Density	0.861 g·cm−3; 0,862 g·cm−3 (E)
Boiling point	122 °C (252 °F; 395 K)
Solubility in water	soluble in water, acetone and ether (E)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Flammable and toxic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H312, H315, H319, H335
Precautionary statements	P210, P233, P240, P241, P242, P243, P261, P264, P271, P280, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P312, P321, P322, P332+P313, P337+P313, P362, P363, P370+P378, P403+P233, P403+P235, P405, P501
Safety data sheet (SDS)	Safety Data Sheet
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

3-Penten-2-one is an organic compound with the formula CH₃C(O)CH=CHCH₃. It exists as (E) and (Z) stereoisomers. The compound is classified as an α,β-unsaturated ketone. It is a colorless volatile liquid with fruity to pungent odor.