Basic Organic Nomenclature
7. Stereochemistry (iii)
Although chiral molecules containing chirality carbon centres are by far the most usual, chiral molecules without a chirality centre exist.
Remember that the definition of chirality requires only that the mirror image of a molecule be non-superimposible on that molecule.
These pages give the briefest of introductions to these molecules.
Here are two examples with their full names:
3. Planar Chirality
An example of this is given by the molecule (E)-cyclooctene:
In this case, put the plane of the molecule on the top and see that the bonds spiral away and down from the double bond in a clockwise direction for the left model, and in an anticlockwise direction for the right model.
Incidentally, this molecule has featured in work that seems to give a clue as to how an exess of one enantiomer over another could have arisen naturally. See chiral hydrocarbon.
|Review Chiral Molecules with
no Chirality Center (i)
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