β-Propiolactone

β-Propiolactone
Names
	Preferred IUPAC name Oxetan-2-one
	Other names Propiolactone; 2-Oxetanone; 3-Hydroxypropanoic acid lactone
Identifiers
CAS Number	57-57-8 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:49073 ;
ChEMBL	ChEMBL1200627 ;
ChemSpider	2275 ;
DrugBank	DB09348;
ECHA InfoCard	100.000.309
EC Number	200-340-1;
KEGG	D05630 ;
PubChem CID	2365;
RTECS number	RQ7350000;
UNII	6RC3ZT4HB0 ;
UN number	2810
CompTox Dashboard (EPA)	DTXSID8021197 ;
	InChI InChI=1S/C3H4O2/c4-3-1-2-5-3/h1-2H2 Key: VEZXCJBBBCKRPI-UHFFFAOYSA-N ; InChI=1/C3H4O2/c4-3-1-2-5-3/h1-2H2 Key: VEZXCJBBBCKRPI-UHFFFAOYAQ;
	SMILES O=C1OCC1;
Properties
Chemical formula	C3H4O2
Molar mass	72.063 g·mol−1
Appearance	Colorless liquid
Odor	slightly sweet
Density	1.1460 g/cm3
Melting point	−33.4 °C (−28.1 °F; 239.8 K)
Boiling point	162 °C (324 °F; 435 K) (decomposes)
Solubility in water	37 g/100 mL
Solubility in organic solvents	Miscible
Vapor pressure	3 mmHg (25°C)
Refractive index (nD)	1.4131
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H315, H319, H330, H350
Precautionary statements	P201, P202, P260, P264, P271, P280, P281, P284, P302+P352, P304+P340, P305+P351+P338, P308+P313, P310, P320, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Flash point	74 °C; 165 °F; 347 K
Explosive limits	2.9%-?
	NIOSH (US health exposure limits):
PEL (Permissible)	OSHA-Regulated carcinogen
REL (Recommended)	Ca
IDLH (Immediate danger)	Ca [N.D.]
	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

β-Propiolactone, often simply called propiolactone, is an organic compound with the formula CH₂CH₂CO₂. It is a member of the lactone family, with a four-membered ring. It is a colorless liquid with a slightly sweet odor, highly soluble in water and organic solvents. The carcinogenicity of this compound has limited its commercial applications.