Pyrazolidine

Pyrazolidine is a heterocyclic compound.

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

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

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Structural formula of pyrazolidine
Ball-and-stick model of the pyrazolidine molecule