N-Methyl-2-pyrrolidone
CAS 872-50-4C5H9NO99.13 g/mol
N-methylpyrrolidin-2-one is a member of the class of pyrrolidine-2-ones that is pyrrolidin-2-one in which the hydrogen attached to the nitrogen is replaced by a methyl group. It has a role as a polar aprotic solvent. It is a lactam, a N-alkylpyrrolidine and a member of pyrrolidin-2-ones.
IUPAC: 1-methylpyrrolidin-2-one
PubChem
Physical & Chemical Properties
| Melting Point | -9 °F (NTP, 1992) |
| Boiling Point | 396 °F at 760 mmHg (NTP, 1992) |
| Density | 1.03 at 77 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | greater than or equal to 100 mg/mL at 68 °F (NTP, 1992) |
| Flash Point | 204 °F (NTP, 1992) |
| Vapor Pressure | 0.34 [mmHg] |
| pH | pH = 7.7-8 |
| Appearance | N-methyl-2-pyrrolidone appears as a clear colorless liquid with a "fishlike" odor. Denser than water. Flash point 199 °F. Contact may irritate skin, eyes and mucous membranes. May be toxic by ingestion. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
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HS Code(s): 2933
Data: UN Comtrade
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