title: Crystal structures of three 3-chloro-3-methyl-2,6-di-aryl-piperidin-4-ones.
abstract: The syntheses and crystal structure of 3-chloro-3-methyl-r-2,c-6-di-phenyl-piperidin-4-one, C18H18ClNO, (I), 3-chloro-3-methyl-r-2,c-6-di-p-tolyl-piperidin-4-one, C20H22ClNO, (II), and 3-chloro-3-methyl-r-2,c-6-bis-(4-chloro-phen-yl)piperidin-4-one, C18H16Cl3NO, (III), are described. In each structure, the piperidine ring adopts a chair conformation and dihedral angles between the mean planes of the phenyl rings are 58.4 (2), 73.5 (5) and 78.6 (2)° in (I), (II) and (III), respectively. In the crystals, mol-ecules are linked intoC(6) chains by weak N-H⋯O hydrogen bonds and C-H⋯π inter-actions are also observed.
authors.affiliation: Research and Development Centre, Bharathiar University, Coimbatore 641 046, Tamilnadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Arulraj
authors.affiliation: Research and Development Centre, Bharathiar University, Coimbatore 641 046, Tamilnadu, India; Department of Chemistry, Thiruvalluvar Arts and Science College, Kurinjipadi 607 302, Tamilnadu, India.
authors.forename: S
authors.initials: S
authors.lastname: Sivakumar
authors.affiliation: Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
authors.forename: Manpreet
authors.initials: M
authors.lastname: Kaur
authors.affiliation: Principal, Government College for Women (Autonomous), Kumbakonam 612 001, Tamilnadu, India.
authors.forename: A
authors.identifier: https://orcid.org/0000-0001-9896-186X
authors.initials: A
authors.lastname: Thiruvalluvar
authors.affiliation: Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
authors.forename: Jerry P
authors.initials: JP
authors.lastname: Jasinski
keywords: 3-chloro-3-methyl-2,6-diphenyl-piperidin-4-ones; C—H⋯π inter­actions; crystal structures; hydrogen bonds