title: Crystal structure of 2,2-di-chloro-1-(piperidin-1-yl)butane-1,3-dione.
abstract: In the title compound, C9H13Cl2NO2, the piperidine ring shows a chair conformation and the O-C-C-O torsion angle between the carbonyl groups is 183.6 (4)°. In the crystal, mol-ecules are linked into an infinite layer along the ab plane by a bifurcated C-H⋯O hydrogen bond between the carbonyl O atom adjacent to the methyl group and one of the methyl-ene groups next to nitro-gen and an additional hydrogen bond of the C-H⋯Cl type. These layers are connected into a three-dimensional supra-molecular arrangement by O⋯Cl contacts [2.8979 (12) and 3.1300 (12) Å].
authors.affiliation: University Koblenz-Landau, Institute for Natural Sciences, Universitätsstrasse 1, 56070 Koblenz, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Schwierz
authors.affiliation: Friedrich-Schiller-University Jena, Institute of Inorganic and Analytical Chemistry, Humboldtstrasse 8, 07743 Jena, Germany.
authors.forename: Helmar
authors.initials: H
authors.lastname: Görls
authors.affiliation: University Koblenz-Landau, Institute for Natural Sciences, Universitätsstrasse 1, 56070 Koblenz, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Imhof
keywords: 2,2-di­chloro-1-(piperidin-1-yl)butane-1,3-dione; O⋯Cl contacts; crystal structure; hydrogen bonding