|View perpendicular to C-C axis||Oblique view||View down C-C axis|
This molecule has a particular symmetry in this conformation (assuming idealised tetrahedral geometry for the bonds around the carbon atoms): the only symmetry element present is the point of inversion in the middle of the C-C bond. You should note that although each carbon atom is chiral the molecule as a whole is not: molecules with a point of inversion are never chiral. Compare the symmetry of this molecule to that of the chiral R,R′ CHFBr-CHFBr molecule.
The point-group symmetry for this molecule is given the crystallographic symbol -1.
Applying a torsional twist about the C-C bond of 180° to this molecule results in a conformation with a different point-group symmetry. What symmetry element is present in this new conformation?
|© Copyright 1997-2006. Birkbeck College, University of London.||Author(s): Jeremy Karl Cockcroft|