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diastereoisomer (diastereoisomeric) excess

Also contains definition of: percent diastereoisomer excess

This is defined by analogy with enantiomer excess, as D 1 − D 2 [and the percent diastereoisomer excess as 100 ( D 1 − D 2 )], where the mole fractions of two diastereoisomers in a mixture or the fractional yields of two diastereoisomers formed in a reaction are D 1 and D 2 ( D 1 + D 2 = 1) The term is not applicable if more than two diastereoisomers are present. Frequently this term is abbreviated to d.e.
PAC, 1996, 68, 2193 (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2205
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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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