If you’ve got a chiral molecule with two stereocenters and the configuration is (R,S), the enantiomer will have the (S,R) configuration. For instance, the enantiomer of (2R,3R)2-bromo-3-iodobutane is (2S,3S)2-bromo-3-iodobutane. The enantiomer will be the molecule with the exact same name except it’s (S,S). Let’s say you’ve got a molecule with two stereocenters and the configuration is (R,R). The enantiomer of (R)-2-butanol? It’s (S)-2-butanol. The enantiomer of (S)-2-chlorobutane? It’s (R)-2-chlorobutane. Pardon me while I push the Caps Lock button:ĮNANTIOMERS ALWAYS HAVE OPPOSITE R,S DESIGNATIONS.īuy “opposite” I mean they have the same names, but their R’s and S’s are reversed. Bottom line for today: you can tell if molecules are enantiomers or diastereomers by looking at their (R,S) designations.Įnantiomers are non-superimposable mirror images of each other.
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