Acta Cryst. (2004). E60, o170-o172  [ doi:10.1107/S1600536803027958 ]

cis-7-Azabicyclo[4.2.0]octan-8-one

Gy. Argay, L. Fábián, A. Kálmán, G. Bernáth and Zs. Cs. Gyarmati

Abstract: Under the strain of the quasi-planar -lactam moiety, the rigid cyclohexane ring in the title compound, C₇H₁₁NO, can assume either a flexible boat form (77%) or a flexible half-chair form (23%). These two forms can be present simultaneously. The racemic crystals, isostructural with the cis-6-azabicyclo[3.2.0]heptan-7-one homologue [Reck et al. (1990). Acta Cryst. C46, 720-722], are characterized by N-HO=C hydrogen bonds that are formed along the screw axes of the similar monoclinic unit cell.

Online 10 January 2004

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