This is defined by analogy with
enantiomer excess, as
[and the
percent diastereoisomer excess as
], where the
mole fractions of two diastereoisomers in a mixture or the fractional yields of two diastereoisomers formed in a reaction are
and
(
)
The term is not applicable if more than two diastereoisomers are present. Frequently this term is abbreviated to
Source:
PAC, 1996, 68, 2193
(Basic terminology of stereochemistry (IUPAC Recommendations 1996))
on page 2205
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.
doi:10.1351/goldbook.
