cis-4,4-Dimethyltricyclo[6.3.0.0^1,7]undecane-2,6-dione

The title compound was obtained as a by-product in the chlorination of a C₅-C₈ fused-ring compound. The formation of a cyclopropane ring, expected from ¹H NMR spectroscopic analysis, was confirmed. The junction at the C-C bond between the seven- and three-membered rings is cis.

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