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

Quick Facts Names, Identifiers ...

Pyrazolidine

Names
Preferred IUPAC name Pyrazolidine[1]
Other names 1,2-Diazolidine
Identifiers
CAS Number	504-70-1 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:33138 N
ChemSpider	71365 N
PubChem CID	79033
UNII	Y0MA3161MR Y
CompTox Dashboard (EPA)	DTXSID30198444
InChI 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
SMILES C1CNNC1
Properties
Chemical formula	C3H8N2
Molar mass	72.10902
Density	1.00 g/cm3 (20 °C)[2]
Melting point	10 to 12[2] °C (50 to 54 °F; 283 to 285 K)
Boiling point	138[2] °C (280 °F; 411 K)
Refractive index (nD)	1.477[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Close

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

${\displaystyle \mathrm {Cl{-}(CH_{2})_{3}{-}Cl\ +\ N_{2}H_{4}\ \xrightarrow {\Delta T} \ C_{3}H_{8}N_{2}\ +\ 2HCl} }$

${\displaystyle \mathrm {Br{-}(CH_{2})_{3}{-}Br\ +\ N_{2}H_{4}\ {\xrightarrow {\Delta T}}\ C_{3}H_{8}N_{2}\ +\ 2HBr} }$

• Pyrazole
• Pyrazoline