enantiomer excess (enantiomeric excess)

Also contains definition of: percent enantiomer excess

For a mixture of (+)- and (−)-enantiomers, with composition given as the mole or weight fractions $F (+)$ and $F (−)$ (where $F (+) + F (−) = 1$ ) the enantiomer excess is defined as $| F (+) − F (−) |$ (and the percent enantiomer excess by $100 | F (+) − F (−) |$ ). Frequently this term is abbreviated as $e.e.$

See: optical purity

Source:

PAC, 1996, 68, 2193 (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2207

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Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.E02070.

Original PDF version: http://www.iupac.org/goldbook/E02070.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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