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The IUPAC Compendium of Chemical Terminology. In practice, it is most often expressed as a percent enantiomeric excess. Definition of diastereomeric in the Definitions.net dictionary. This has led to informal use the two terms as interchangeable, especially because optical purity was the traditional way of measuring enantiomeric excess. Enantiomeric excess is used as one of the indicators of the success of an asymmetric synthesis. The ideal equivalence between enantiomeric excess and optical purity does not always hold. The term enantiomeric excess was introduced in 1971 by Morrison and Mosher in their publication Asymmetric Organic Reactions. Diastereomers (sometimes called diastereoisomers) are a type of a stereoisomer. However, other methods such as chiral column chromatography and NMR spectroscopy can now be used for measuring the amount of each enantiomer individually. (1) The enantiomeric excess can be determined in another way if we know the amount of each enantiomer produced.          Sexual Content

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