Organic Chemistry

Structures and Nomenclature

What does enantiomeric excess measure?

The enantiomeric excess is a measure of how much more of one enantiomer is present in a mixture. It’s often reported as a percentage. Racemic mixtures have an enantiomeric excess value of 0% because both enantiomers are present in equal amounts. For a solution composed of 75% of one enantiomer, the enantiomeric excess would be 50% (75% – 25% = 50%).


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