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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.
PAC, 1996, 68, 2193 (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2207
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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: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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