Pyrazolidine
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Pyrazolidine is a heterocyclic compound. It is a liquid that is stable in air, but it is hygroscopic.
Preparation
Pyrazolidine can be produced by cyclization of 1,3-dichloropropane or 1,3-dibromopropane with hydrazine:
Cl−(CH2)3−Cl + N2H4 → C3H8N2 + 2 HCl
Br−(CH2)3−Br + N2H4 → C3H8N2 + 2 HBr