2-Pyrrolidone

2-Pyrrolidone
Names
	Preferred IUPAC name Pyrrolidin-2-one
	Other names 2-Pyrrolidone; 2-Pyrrolidinone; Aminobutyrolactam; Butyrolactam; γ-Butyrolactam; 2-Ketopyrrolidine;
Identifiers
CAS Number	616-45-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:36592 ;
ChEMBL	ChEMBL276849 ;
ChemSpider	11530 ;
ECHA InfoCard	100.009.531
EC Number	210-483-1;
Gmelin Reference	49671
PubChem CID	12025;
UNII	KKL5D39EOL ;
CompTox Dashboard (EPA)	DTXSID8027246 ;
	InChI InChI=1S/C4H7NO/c6-4-2-1-3-5-4/h1-3H2,(H,5,6) Key: HNJBEVLQSNELDL-UHFFFAOYSA-N ; InChI=1/C4H7NO/c6-4-2-1-3-5-4/h1-3H2,(H,5,6) Key: HNJBEVLQSNELDL-UHFFFAOYAP;
	SMILES O=C1NCCC1;
Properties
Chemical formula	C4H7NO
Molar mass	85.106 g·mol−1
Density	1.116 g/cm3
Melting point	25 °C (77 °F; 298 K)
Boiling point	245 °C (473 °F; 518 K)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H319
Precautionary statements	P305+P351+P338
NFPA 704 (fire diamond)	2 1 0
Flash point	129 °C (264 °F) (open cup); 138 °C (280 °F) (closed cup)
Related compounds
Related compounds	2-Pyrrolidone-5-carboxylic acid
	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-Pyrrolidone, also known as 2-pyrrolidinone or butyrolactam, is an organic compound consisting of a 5-membered lactam, making it the simplest γ-lactam. It is a colorless liquid that is miscible with water and most common organic solvents.

2-Pyrrolidone itself and it various derivatives, especially N-methylpyrrolidone, have a variety of industrial uses.