title: 3-Chloro-pyridin-2-amine.
abstract: In the title compound, C(5)H(5)ClN(2), a by-product in the synthesis of ethyl 2-(3-chloro-pyridin-2-yl)-5-oxopyrazolidine-3-carboxyl-ate, the amine groups form inter-molecular hydrogen-bonding associations with pyridine N-atom acceptors, giving centrosymmetric cyclic dimers. Short inter-molecular Cl⋯Cl inter-actions [3.278 (3) Å] also occur.
authors.forename: Zhi-Nan
authors.initials: ZN
authors.lastname: Hu
authors.forename: Hui-Bin
authors.initials: HB
authors.lastname: Yang
authors.forename: Huan
authors.initials: H
authors.lastname: Luo
authors.forename: Bin
authors.initials: B
authors.lastname: Li