title: 1-[Bicyclo-[4.2.0]octa-1(6),2,4-trien-3-yl]-3-(but-3-en-yl)imidazolium bromide.
abstract: In the title compound, C(15)H(17)N(2) (+)·Br(-), the cyclo-butene and benzene rings are coplanar. The dihedral angle between the benzene and imidazolium rings is 21.2 (3)°. In the crystal structure, the C(15)H(17)N(2) (+) and Br(-) ions are linked into a zigzag chain along the b axis by C-H⋯Br hydrogen bonds, and weak C-H⋯π inter-actions involving the benzene ring of a screw-related cation.
authors.forename: Fang-Hua
authors.initials: FH
authors.lastname: Zhu
authors.forename: Jun-Xiao
authors.initials: JX
authors.lastname: Yang
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Ru-Gang
authors.initials: RG
authors.lastname: Xie