11-(2,2-Dimethylpropyl)-12-{2-[12-(2,2-dimethylpropyl)-9,10-dihydro-9,10-ethenoanthracen-11-yl]ethyl}-9,10-dihydro-9,10-ethenoanthracene

Reaction of tert-butyl­lithium with 11,12-di­methyl­ene-9,10-di­hydro-9,10-ethano­anthracene and 4,5-di­iodo­penta­cyclo­[4.3.0.0^2,4.0^3,8.0^5,7]­nonane gives three products, one of which crystallizes from petroleum ether as the title compound, C₄₄H₄₆, (I). Molecules of (I) are positioned on inversion centers (Z' = 0.5) in the space group P2₁/n and lack any discernible intermolecular interactions.

11,12-Bis(2,2-dimethyl­prop­yl)-9,10-dihydro-9,10-ethenoanthracene

The title compound, C₂₆H₃₂, was retrieved as one of three products from the reaction of tert-butyl­lithium with 11,12-dimethyl­ene-9,10-dihydro­ethenoanthracene and 4,5-diiodo­penta­cyclo­[4.3.0.0^2,4.0^3,8.0^5,7]nonane. The structure shows the expected ethenoanthracene geometry with mol­ecules arranged via van der Waals surfaces.