Acta Cryst. (2006). E62, o11-o12  [ doi:10.1107/S1600536805038833 ]

(±)-2,3,3a,4,5,6-Hexahydro-7-methyl-1,12-dioxo-2,3a-propanophenalene: a new four-ring carbocyclic system

D. Zewge, H. W. Thompson, R. A. Lalancette and A. P. J. Brunskill

Abstract: The title racemate, C₁₇H₁₈O₂, is a tetracylic diketone isolated from the base-catalysed Robinson annulation of 2-(2-carbethoxyethyl)cyclohexanone. It represents a previously unreported four-ring carbocyclic system. In the crystal structure, the packing includes three close intermolecular C-HO dipolar contacts, involving both ketones.

Online 3 December 2005

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