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-吡咯烷酮是最簡單的γ-內醯胺，可用作有機溶劑，是一種重要的有機中間體。 其在室溫下為無色液體，能與水和多數有機溶劑混溶 [ 3 ] 。 製備

2-吡咯烷酮的主要用途和注意事项 2-吡咯烷酮用作溶剂和有机合成中间体，用来制造尼龙-4及乙烯基 吡咯烷酮等。主要用作合成树脂、农药、多元醇、油墨、碘等的溶剂。

2-Pyrrolidone's production and use as a precursor to N-vinyl-2-pyrrolidone may result in its release to the environment through various waste streams. If released to air, a vapor pressure of 9.49X10-3 mm Hg at 25 °C indicates 2-pyrrolidone will exist solely in the vapor phase in the ambient atmosphere.

中文名:α-吡咯烷酮,英文名:2-Pyrrolidinone,CAS:616-45-5,化学式:C4H7NO,分子量:85.1,密度:1.12 g/mL at 25 °C (lit.),熔点:23-25 °C (lit.),沸点:245 °C (lit.),闪点:>230°F,水溶性:miscible,蒸汽压:0.04 hPa (20 °C),折射率:n20/D 1.487(lit.),MSDS.

2-Pyrrolidinone is used as a starting material in the synthesis of polyvinylpyrrolidone (PVP), (±)-tashiromine, (±)-tetraponerine T4, (+)-ricciocarpins A and B.

IUPAC Standard InChIKey: HNJBEVLQSNELDL-UHFFFAOYSA-N Copy CAS Registry Number: 616-45-5 Chemical structure: This structure is also available as a 2d Mol file or as a ...

2-Pyrrolidone for synthesis. CAS 616-45-5, pH 9 - 11 (100 g/l, H₂O, 20 °C). - Find MSDS or SDS, a COA, data sheets and more information.

2-Pyrrolidone is a precursor of N-vinylpyrrolidone (NVP). It also finds application as a solvent in the manufacture of membrane filters for e.g. sterile filtration of drugs such as pharmaceutical proteins, wine filtration systems.

化学性质：2-吡咯烷酮为无色的高沸点极性溶剂，也是有机合成的中间体。 可用来制造锦纶-4。 其钾盐在(1.38MPa)以上压力下，140~160℃与乙炔反应，生成N-乙烯基-2-吡啶烷酮。