Acta Cryst. (2005). E61, o3983-o3984  [ doi:10.1107/S1600536805035294 ]

Quininium (S)-2-chloro-n-butyrate

B. Samas, A. C. Blackburn and K. C. Kreuchauf

Abstract: The title compound, C₂₀H₂₅N₂O₂⁺·C₄H₆ClO₂^-, was crystallized by evaporation of an acetone solution and this is the first published report describing the structure of a crystal phase for this salt. Quinine is commonly used as a resolving agent for classic resolution. The anion was of interest because it has several desirable properties for absolute configuration studies, viz. strong acidic pK_a for salt formation, a somewhat heavy atom for strong diffraction and a known stereocenter.

Online 5 November 2005

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