Pyrrolidine, also known as tetrahydropyrrole, is an organic compound with the molecular formula (CH2)4NH. It is a cyclic secondary amine, also classified as a saturated heterocycle. It is a colourless liquid that is miscible with water and most organic solvents. It has a characteristic odor that has been described as "ammoniacal, fishy, shellfish-like". In addition to pyrrolidine itself, many substituted pyrrolidines are known.
|Preferred IUPAC name
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||71.123 g·mol−1|
|Appearance||Clear colorless liquid|
|Melting point||−63 °C (−81 °F; 210 K)|
|Boiling point||87 °C (189 °F; 360 K)|
|Acidity (pKa)||11.27 (pKa of conjugate acid in water),|
19.56 (pKa of conjugate acid in acetonitrile)
Refractive index (nD)
|1.4402 at 28°C|
|Main hazards||highly flammable, harmful, corrosive, possible mutagen|
|Safety data sheet||MSDS|
|GHS signal word||Danger|
|H225, H302, H314, H318, H332|
|P210, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P280, P301+312, P301+330+331, P303+361+353, P304+312, P304+340, P305+351+338, P310, P312, P321, P330, P363, P370+378, P403+235|
|Flash point||3 °C (37 °F; 276 K)|
|345 °C (653 °F; 618 K)|
Related nitrogen heterocyclic compounds
|Pyrrole (aromatic with two double bonds)|
Pyrroline (one double bond)
Pyrrolizidine (two pentagonal rings)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Production & synthesisEdit
Pyrrolidine is prepared industrially by the reaction of 1,4-Butanediol and ammonia at a temperature of 165–200 °C and a pressure of 17–21 MPa in the presence of a cobalt- and nickel oxide catalyst, which is supported on alumina.
The reaction is carried out in the liquid phase in a continuous tube- or tube-bundle-reactor, which is operated in the cycle gas method. The catalyst is arranged as a fixed-bed and the conversion is carried out in the downflow mode. The product is obtained after multistage purification and separation by extractive and azeotropic distillation.
Many modifications of pyrrolidine are found in natural and synthetic chemistry. The pyrrolidine ring structure is present in numerous natural alkaloids such as nicotine and hygrine. It is found in many drugs such as procyclidine and bepridil. It also forms the basis for the racetam compounds (e.g. piracetam, aniracetam). The amino acids proline and hydroxyproline are, in a structural sense, derivatives of pyrrolidine.
- 4-chlorobuta-1-amine with a strong base:
Pyrrolidine is a base. Its basicity is typical of other dialkyl amines. Relative to many secondary amines, pyrrolidine is distinctive because of its compactness, a consequence of its cyclic structure.
- Hall, H. K. (1957). "Correlation of the Base Strengths of Amines". Journal of the American Chemical Society. 79 (20): 5441–5444. doi:10.1021/ja01577a030.
- Kaljurand, I.; Kütt, A.; Sooväli, L.; Rodima, T.; Mäemets, V.; Leito, I.; Koppel, I. A. (2005). "Extension of the Self-Consistent Spectrophotometric Basicity Scale in Acetonitrile to a Full Span of 28 pKa Units: Unification of Different Basicity Scales". The Journal of Organic Chemistry. 70 (3): 1019–1028. doi:10.1021/jo048252w. PMID 15675863.
- Pyrrolidine, The Good Scents Company
- Bou Chedid, Roland; Melder, Johann-Peter; Dostalek, Roman; Pastre, Jörg; Tan, Aik Meam. "Process for the preparation of pyrrolidine". Google Patents. BASF SE. Retrieved 5 July 2019.
- H. K. Hall, Jr. (1957). "Correlation of the Base Strengths of Amines". J. Am. Chem. Soc. 79 (20): 5441. doi:10.1021/ja01577a030.
- R. B. Woodward, I. J. Pachter, and M. L. Scheinbaum (1974). "2,2-(Trimethylenedithio)cyclohexanone". Organic Syntheses. 54: 39.CS1 maint: multiple names: authors list (link); Collective Volume, 6, p. 1014
- Media related to Pyrrolidine at Wikimedia Commons