Guide to Stereochemistry Terms
ChiralA molecule is chiral if it is not superposable on its mirror image.
AchiralA molecule is achiral if it is superposable on its mirror image.
MesoA molecule is meso if it is achiral and contains two or more stereocenters.
EnantiomersStereoisomers that are non-superposable mirror images.
DiastereomersStereoisomers that are non-superposable, but are not mirror images.
Constitutional IsomersIsomers which contain atoms that differ in connectivity.
Non-isomersCompounds that do not have the same molecular formula.
SuperposableA term that describes the ability to precisely overlap one object over another. Only identical objects are superposable, everything else is non-superposable.
StereoisomersIsomers which have atoms that differ only by their orientation in space. Unlike constitutional isomers, corresponding atoms in stereoisomers exhibit the same connectivity.
IsomersCompounds that have the same molecular formula.