MoreStereochemistry - ligands(groups attached to an atom...

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L. D. Shirtcliff – CHEM 3053 From previous handout (Stereochemical Terminology): A molecule (or other object) is chiral if it possesses no alternating symmetry axes (Sn - rotation/reflection). Such a condition makes the chiral molecule nonsuperimposable on its mirror image. The property is called chirality . (Note that optical activity is a measurable; chirality is not.) An achiral molecule does possess an Sn and is superimposable on its mirror image. New: A stereogenic element is a focus of stereoisomerism in a molecule such that interchange of two
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Unformatted text preview: ligands (groups) attached to an atom leads to a stereoisomer. For example, switch a and b in tetrahedral C abxy and the enantiomer of the original molecule is produced. (The abbreviated term stereocenter is often used to denote the carbon in such a molecule, and * is often used to denote it.) Switch a and b in alkene ab C=C xy and a diastereomer of the original is produced. C C a b x y C C b a x y a/b interchange C b y x a a/b interchange C a y x b C b y x a...
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