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Enantiomerically pure (1S,5R) and racemic 3‐(1‐benzothiophen‐2‐yl)‐8‐azoniabicyclo[3.2.1]oct‐2‐ene acetate

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Abstract:

The title compound, C15H16NS+·C2H3O2 , has been crystallized as both a pure enantiomer (1S,5R) and a racemate. The racemate crystallizes in the space group Cc, with molecules of opposite handedness related to each other by the action of the c‐glide. The enantiomer is essentially isostructural with the racemate, except that the glide symmetry is violated by interchange of CH and CH2 groups within the seven‐membered ring. The space‐group symmetry is reduced to P1 with two molecules in the asymmetric unit. The enantiomer structure shows disorder of the thiophene ring for one of the molecules in the asymmetric unit. The major component of the disorder has the thiophene ring in the same position as in the racemate, but generates a higher‐energy molecular conformation. The minor disorder component has different intermolecular interactions but retains a more stable molecular conformation.

Document Type: Research Article

DOI: http://dx.doi.org/10.1107/S0108270112030569

Publication date: August 15, 2012

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