1,2,3,4,5,6,7,8,13,13,14,14-Dodeca-chloro-1,4,4a,4b,5,8,8a,12b-octa-hydro-1,4:5,8-dimethano-triphenyl-ene at 90 K.
The previously reported room-temperature crystal structure [Jaud Baldy, Negrel, Poite & Chanon (1993 ▶). Z. Kristallogr.204, 289-291] of the title compound, C(20)H(8)Cl(12), is monoclinic with Z' = 1, whereas the 90 K structure reported herein is triclinic with Z' = 2 and shows a 2% volume contraction. The crystallographically independent unit chosen consists of both enanti-omers (Λ and Δ) of this propeller-like mol-ecule. Both enanti-omers display quasi-twofold symmetry, with average bond-length/bond-angle deviations of 0.0018 (4) Å and 0.41 (2)° for Λ, and 0.0026 (4) Å and 0.50 (2)° for Δ.
Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-1804,  USA.
Brandon W
BW
Jenkins
Frank R
FR
Fronczek
Steven F
SF
Watkins