| Preferred IUPAC name
| Other names
|3D model (Jmol)||Interactive image|
|Molar mass||71.12 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),|
|Main hazards||highly flammable, harmful, corrosive, possible mutagen|
|Safety data sheet||MSDS|
|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 ?)|
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 semen-like odor. Compared to acyclic secondary amines, it is about 10 times more basic.
Synthesis and occurrence
Pyrrolidine is found in the leaves of tobacco and carrot. The pyrrolidine ring structure is present in numerous natural alkaloids such as nicotine and hygrine. It is found in many pharmaceutical 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.
Pyrrolidine is used as a building block in the synthesis of more complex compounds. In organic chemistry, pyrrolidine is used to activate ketones and aldehydes toward nucleophilic addition by formation of enamines:
- 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.
- Journal of Chemical Ecology September 1975, Volume 1, Issue 3, pp 299–310], Specific Anosmia to 1-Pyrrolidine
- Karsten Eller, Erhard Henkes, Roland Rossbacher, Hartmut Höke "Amines, Aliphatic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. doi:10.1002/14356007.a02_001
- R. B. Woodward, I. J. Pachter, and M. L. Scheinbaum (1974). "2,2-(Trimethylenedithio)cyclohexanone". Org. Synth. 54: 39.; Coll. Vol., 6, p. 1014