W. Clegg, B. Golding, B. J. King
Sep 15, 1995
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Influential Citations
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Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The bicyclo[2.2.1]heptane unit is essentially invariant in all four structures, reflecting its rigid nature. The four isomers (1S,2S,4R,4'S)-, (1S,2S,4R,4'R)-, (1S,2R,4R,4'R)- and (1S,2R,4R,4'R)-4,7,7-trimethylbicyclo[2.2.1]heptan-3-one-2-spiro-2'-(4'-chloromethyl-1',3'-dioxolane), C 13 H 19 ClO 3 , have different positions of substitution by the CH 2 Cl group in the ethylene segment of the dioxolane ring. In each case, this ring has an envelope conformation but the identity of the flap atom varies. All four molecules have a similar overall shape and hence give similar packing patterns, resulting in close correspondence or simple relationships for the four sets of unit-cell parameters and the space groups of the structures.