sym-Hexahydropyren

<div class="line" id="line-5"> In 1,2,3,6,7,8-hexahydropyrene, C <span style="font-size: 9px;"> 16 </span> H <span style="font-size: 9px;"> 16 </span> , the unsaturated rings lie essentially in a plane, the r.m.s. deviation of the atoms defining the plane from the best-fit plane being 0.006&nbsp;(2)&nbsp;&Aring;. The saturated rings are substantially non-planar, but the character of the non-planarity of the saturated rings is quite different from that observed in octahydrochrysene. The C-C bond distances in the saturated rings are quite uniform, ranging from 1.505&nbsp;(2) to 1.520&nbsp;(2)&nbsp;&Aring;. No intermolecular distance is less than the sum of the corresponding van der Waals radii; closest approaches involve both C <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> H and H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> H interactions.</div><div class="line" id="line-15"> <br/></div>