organic compounds
The cyclophane groups of the two title compounds, planar-chiral dimethylbis(tricyclo[8.2.2.24,7]tetradeca-4,6,10,12,13,15-hexaen-5-yl)silane, C34H36Si, and its meso analogue, display similar geometric features to the parent compound [2.2]paracyclophane and also to [2.2]paracyclophane units in other structures; the aromatic rings are distorted in the typical way. The para-C atoms are bent out of the plane of the other four approximately coplanar atoms into a boat conformation. The aromatic rings are twisted with respect to one another. The Csp3-Csp3 bond lengths of the methylene bridges are slightly longer than standard values in unstrained systems.