Acta Cryst. (2013). E69, o1794-o1795 [ doi:10.1107/S1600536813030377 ]
Abstract: The title salt, C18H21FNO2+·Br-, determined at 115 K, crystallizes in the triclinic space group P1. The previously reported polymorph occurs in the monoclinic space group P21 and has two independent molecules in the asymmetric unit [Peeters et al. (1993). Acta Cryst. C49, 2157-2160]. In the title molecule, the pyran rings adopt half-chair conformations. The absolute configuration is S for the hydroxy-bearing C atom and R for the asymmetric C atom in the dihydropyran unit. In the crystal, the components are linked by N-HBr and O-HBr hydrogen bonds, forming chains along the c-axis direction. The crystal studied was refined as an inversion twin.
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