enantiomeric excess

(redirected from Diastereomeric excess)

enantiomeric excess

[ə¦nan·tē·ō¦mer·ik ek′ses]
(organic chemistry)
In an asymmetric synthesis, a chemical yield that contains more of the desired enantiomer than other products.
References in periodicals archive ?
This method avoided the formation of disulfanilated product in the first step and conducted to the product (8) in 65% yield and 59% of diastereomeric excess, calculated from the integration of the [sup.
After purification, the 2-methylsulfanyl-2methylsulfinyl-1-indanone was obtained in 84% yield and 73% of diastereomeric excess.
In this case, the obtained yield was 93% and 73% of diastereomeric excess.
The yields obtained were 93% and 90% diastereomeric excess.
4] was performed in metanol as solvent, isolating a unique diastereoisomer (10) in 70% yield and 90% of diastereomeric excess (Scheme 5).
An example of asymmetric synthesis is the generation of allylglcine 10 and other unnatural [varies]-aminoacids via zinc mediated allylation in aqueous media with diastereomeric excess (de) as high as 99:1.