2-Piperidinone

2-Piperidinone (2-piperidone or δ-valerolactam) is an organic compound with the formula (CH₂)₄CONH. Valerolactam is formed by dehydrogenation of 5-amino-1-pentanol, catalyzed by rhodium and ruthenium complexes, ^[3][4] The compound, a colorless solid, is classified as a lactam.

2-Piperidinone

Names
Preferred IUPAC name Piperidin-2-one
Other names δ-Valerolactam 2-Piperidinone 2-Piperidone
Identifiers
CAS Number	675-20-7 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:77761 Y
ChemSpider	12144
ECHA InfoCard	100.010.567
PubChem CID	12665
UNII	WLN0GQQ6EK Y
CompTox Dashboard (EPA)	DTXSID1060976
InChI InChI=1S/C5H9NO/c7-5-3-1-2-4-6-5/h1-4H2,(H,6,7) Key: XUWHAWMETYGRKB-UHFFFAOYSA-N InChI=1/C5H9NO/c7-5-3-1-2-4-6-5/h1-4H2,(H,6,7) Key: XUWHAWMETYGRKB-UHFFFAOYAE
SMILES O=C1NCCCC1
Properties
Chemical formula	C5H9NO
Molar mass	99.133 g·mol−1
Density	1.073 g/cm3[1]
Melting point	38 to 40 °C (100 to 104 °F; 311 to 313 K)[2]
Boiling point	256 °C (493 °F; 529 K)[2]
Solubility in water	291 g/L[1]
Hazards
Flash point	> 110 °C (230 °F; 383 K)[1]
Safety data sheet (SDS)	MSDS
Related compounds
Related compounds	4-Piperidinone
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

It is the monomer of nylon 5, a polyamide:

n (CH₂)₄CONH → [HN(CH₂)₄CO)]_n