title: 2,2,6,6-Tetra-methyl-4-oxopiperidin-1-ium 4-chloro-3-nitro-benzoate.
abstract: The title salt, C(9)H(18)NO(+)·C(7)H(3)ClNO(4) (-), was obtained as an unexpected product of the reaction of 4-chloro-3-nitro-benzoyl isothio-cyanate with pyrrolidine. The six-membered ring of the 4-oxopiperidinium cation adopts a chair conformation. In the crystal structure, two cations and three anions are linked together by inter-molecular N-H⋯O and C-H⋯O hydrogen bonds and arranged diagonally along the ac face.
authors.affiliation: School of Chemical Sciences and Food Technology, Universiti Kebangsaan Malaysia, UKM 43500 Bangi Selangor,  Malaysia.
authors.forename: Bohari M
authors.initials: BM
authors.lastname: Yamin
authors.forename: Norsakina Z
authors.initials: NZ
authors.lastname: Zulkifli
references.citation: Acta Crystallogr D Biol Crystallogr. 2009 Feb;65(Pt 2):148-55
references.pmid: 19171970
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2008 Aug 13;64(Pt 9):o1753
references.pmid: 21201735
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2009 Sep 05;65(Pt 10):o2365-6
references.pmid: 21577832
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2010 Dec 15;67(Pt 1):o122
references.pmid: 21522633