Zhiyong Hu, Huibin Yang, Huan Luo
Apr 16, 2011
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Journal
Acta Crystallographica Section E: Structure Reports Online
Abstract
In the title compound, C5H5ClN2, a by-product in the synthesis of ethyl 2-(3-chloropyridin-2-yl)-5-oxopyrazolidine-3-carboxylate, the amine groups form intermolecular hydrogen-bonding associations with pyridine N-atom acceptors, giving centrosymmetric cyclic dimers. Short intermolecular Cl⋯Cl interactions [3.278 (3) Å] also occur.