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Stereochemistry Monday, January 25, 20169:01 AM • Stereochemistry ○ Chiral § Molecule or object not superimposable over its mirror image § Like hands in a mirror Achiral ○ § Molecule or object that is superimposable § Looks the same when reversed in mirror § Like socks ○ With molecules, you can rotate them ○ Not superimposable if you cannot rotate them to align ○ Enantiomers § Stereoisomer § When the superimposed image is different § Achiral ○ Chiral carbon § A carbon atom with four different groups § Tetrahedral shape § Also called asymmetric carbon § Often designated with asterisks (*) ○ Chiral centers § Carbon center ○ Stereocenter § Also called stereogenic atom § Atom where the Interchange of two groups gives a stereoisomer § For rings, draw the ring as a flat polygon and look for tetrahedral carbon groups ○ In general, a molecule with no asymmetric carbon will not be chiral