1,7-Dimethylpentacyclo[5.4.0.02,6.- 03,10.05,9]undecane-8,11-dione

Abstract

The structure of the title compound, C13H14O2, a pentacycloundecane cage derivative, exhibits unusual Csp3—Csp3 singlebond lengths ranging from 1.505 (3) to 1.607 (2) A ° and strained bond angles as small as 88.7 (1) and as large as 121.0 (2) . In this meso compound, an internal non-crystallographic mirror plane exists, bisecting the molecule. In the crystal, weak C—H O hydrogen bonds link the molecules into an infinite spiral about a twofold screw axis along the [100] direction.