Structural Formula Vector Image
Title: 2-Pyrrolidone
CAS Registry Number: 616-45-5
CAS Name: 2-Pyrrolidinone
Additional Names: 2-oxopyrrolidine; a-pyrrolidone; 2-ketopyrrolidine
Molecular Formula: C4H7NO
Molecular Weight: 85.10
Percent Composition: C 56.45%, H 8.29%, N 16.46%, O 18.80%
Literature References: Prepd on a large scale from butyrolactone by a Reppe process: DE 1085525 (to BASF). Other prepns: Metzger, Seelert, Angew. Chem. 75, 919 (1963); Copenhaver, Ney, US 3095423 (1963 to Minnesota Mining & Manuf); Lidov, US 3109005 (1963 to Halcon International).
Properties: Liquid above 25°. bp760 245°; bp9.2 113-114°; bp0.2 76°. d425 1.116. Flash pt, open cup: 265°F (129°C). Viscosity at 25° = 13.3 cP. Dipole moment: 2.3. In the presence of the stoichiometric amount of water a cryst monohydrate, mp 30°, can be formed. Non-corrosive. Good chemical stability. Miscible with water, ethanol, ether, chloroform, benzene, ethyl acetate, carbon disulfide.
Melting point: mp 30°
Boiling point: bp760 245°; bp9.2 113-114°; bp0.2 76°
Flash point: Flash pt, open cup: 265°F (129°C)
Density: d425 1.116
Use: Intermediate in the manuf of polyvinylpyrrolidone and polypyrrolidone (a polymer, formed in the presence of alkaline catalysts). Also used as high-boiling solvent in petroleum processing, acrylonitrile manuf. Industrial solvent for polymers, chlordane, DDT, sorbitol, glycerol, iodine, sugars. In specialty printers inks. As plasticizer and coalescing agent for acrylic-styrene emulsion-type floor polishes.

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