Pyrazolidine

Structural formula
General
Surname	Pyrazolidine
other names	Tetrahydropyrazole Diazolidine
Molecular formula	C 3 H 8 N 2
External identifiers / databases
CAS number 504-70-1 PubChem 79033 ChemSpider 71365 Wikidata Q411281
properties
Molar mass	72.11 g mol −1
Physical state	liquid
density	1.00 g cm −3 (20 ° C)
Melting point	10-12 ° C
boiling point	138 ° C
Refractive index	1.477
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Pyrazolidine is a chemical compound consisting of a five-membered saturated ring that has two neighboring nitrogen atoms. It forms the basic structure of the pyrazolidines . Its unsaturated analogue is pyrazole .

presentation

Pyrazolidine can be obtained from the cyclization of 1,3-dichloropropane or 1,3-dibromopropane with hydrazine .

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

properties

It is a liquid at room temperature, solidifies at 10-12 ° C and boils at 138 ° C. The compound is stable in air, but is highly hygroscopic .

Individual evidence

1. ↑ ^{a b c d e f} E. L. Buhle, AM Moore, FY Wiselogle: The Configuration of Tervalent Nitrogen. A Bicyclic Hydrazine Derivative . In: J. Am. Chem. Soc. 1943 , 65 , pp. 29-32. doi : 10.1021 / ja01241a009
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.