Der Enantiomerenüberschuss, oder kurz e.e.-Wert (von englisch: enantiomeric excess), gibt den Überschuss eines Enantiomers in einem Gemisch an. Er ist definiert als
mit m1: Masse des Enantiomers im Überschuss, m2: Masse des Enantiomers im Unterschuss
Bei einem Racemat ist demnach e.e.= 0 %, bei einer enantiomerenreinen Verbindung ist e.e.= 100 %
Siehe auch: Enantioselektive Synthese, Enantioselektive Katalyse
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