title: rac-2,2'-Bipiperidine-1,1'-diium dibromide.
abstract: In the title compound, C(10)H(22)N(2) (2+)·2Br(-), a precursor in the synthesis of organocatalysts, the bipiperidinium ion is located on a twofold rotation axis which passes through the mid-point of the central C-C bond. The piperidinium ring adopts a chair conformation. In the crystal, the cations are linked together by Br(-) ions through N-H⋯Br hydrogen bonds, forming layers parallel to the ab plane.
authors.affiliation: Tallinn University of Technology, Department of Chemistry, Akadeemia tee 15, 12618 Tallinn, Estonia.
authors.forename: Marju
authors.initials: M
authors.lastname: Laars
authors.forename: Kerti
authors.initials: K
authors.lastname: Ausmees
authors.forename: Marina
authors.initials: M
authors.lastname: Kudrjashova
authors.forename: Tõnis
authors.initials: T
authors.lastname: Kanger
authors.forename: Franz
authors.initials: F
authors.lastname: Werner