Article · Wikipedia archive · Last revised Jun 26, 2026

Pyrazolidine

Pyrazolidine is a heterocyclic compound. It is a liquid that is stable in air, but it is hygroscopic.

Last revised
Jun 26, 2026
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≈ 1 min
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Wikipedia ↗
Pyrazolidine
Structural formula of pyrazolidine
source ↗
Ball-and-stick model of the pyrazolidine molecule
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Names
Preferred IUPAC name
Pyrazolidine1
Other names
1,2-Diazolidine
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
UNII
  • InChI=1S/C3H8N2/c1-2-4-5-3-1/h4-5H,1-3H2 ☒N
    Key: USPWKWBDZOARPV-UHFFFAOYSA-N ☒N
  • InChI=1/C3H8N2/c1-2-4-5-3-1/h4-5H,1-3H2
    Key: USPWKWBDZOARPV-UHFFFAOYAM
  • C1CNNC1
Properties
C3H8N2
Molar mass 72.10902
Density 1.00 g/cm3 (20 °C)2
Melting point 10 to 122 °C (50 to 54 °F; 283 to 285 K)
Boiling point 1382 °C (280 °F; 411 K)
1.4772
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Pyrazolidine is a heterocyclic compound. It is a liquid that is stable in air, but it is hygroscopic.2

Preparation

Pyrazolidine can be produced by cyclization of 1,3-dichloropropane or 1,3-dibromopropane with hydrazine:2

Cl−(CH2)3−Cl + N2H4 → C3H8N2 + 2 HCl
Br−(CH2)3−Br + N2H4 → C3H8N2 + 2 HBr
See also

See also

References

References

  1. International Union of Pure and Applied Chemistry (2014). Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013. The Royal Society of Chemistry. p. 142. doi:10.1039/9781849733069. ISBN 978-0-85404-182-4.
  2. Buhle, Emmett L.; Moore, Alexander M.; Wiselogle, F. Y. (1943). "The Configuration of Tervalent Nitrogen. A Bicyclic Hydrazine Derivative1". Journal of the American Chemical Society. 65 (1). American Chemical Society (ACS): 29–32. doi:10.1021/ja01241a009. ISSN 0002-7863.