N-Methyl-2-pyrrolidone (NMP) is an organic solvent with the chemical formula C₅H₉NO. It is a colorless, odorless to slightly ammonia-like liquid that is highly polar and capable of dissolving a wide range of both polar and non-polar substances. NMP is a pyrrolidone derivative, containing a pyrrolidine ring with a methyl group attached at the nitrogen atom. It is widely used in industries such as pharmaceuticals, electronics, paints and coatings, agrochemicals, and chemical synthesis.
NMP is an effective solvent due to its high solvency power and low volatility, making it useful in various demanding applications, including cleaning, extraction, and polymer processing.
Properties of N-Methyl-2-Pyrrolidone (NMP):
- Molecular Formula: C₅H₉NO
- Molar Mass: 99.13 g/mol
- CAS Number: 872-50-4
- Functional Group: Contains a pyrrolidone ring (a cyclic amide) with a methyl group attached to the nitrogen.
- Reactivity:
- NMP is highly polar and is considered a polar aprotic solvent, making it useful for dissolving a variety of organic and inorganic compounds, including polymers, salts, and organometallic compounds.
- It is stable under normal conditions and is non-reactive in most environments.
- NMP can hydrolyze under strong acid or basic conditions to form lactams and amines.
- The pyrrolidone group can participate in nucleophilic substitution reactions.
- Appearance: A colorless, odorless or slightly ammonia-like liquid.
- Density: 1.03 g/cm³ at 20°C.
- Melting Point: –24°C (–11.2°F).
- Boiling Point: 202°C (396°F).
- Viscosity: 1.66 cP at 20°C (highly viscous).
- Solubility:
- Miscible with water and a wide variety of organic solvents including alcohols, ethers, and acetone.
- It has the ability to dissolve both polar and non-polar substances, making it highly versatile as a solvent.
Uses of N-Methyl-2-Pyrrolidone (NMP):
- Solvent: A highly polar solvent used in a variety of applications, including drug delivery and chemical synthesis.
- Pharmaceuticals: Used as a solvent in drug formulations and transdermal patches.
- Electronics: Used in the production of semiconductors and lithium-ion batteries.