In practice, it is most often expressed as a percent enantiomeric excess.

The degree of selectivity is measured by the enantiomeric excess.

The enantiomeric excess of a substance can also be determined using certain optical methods.

The enantiomeric excess can be determined in another way if we know the amount of each enantiomer produced.

The ideal equivalence between enantiomeric excess and optical purity does not always hold.

In general, at lower temperatures enantiomeric excesses (ee's) are obtained.

Third, the products of the Sharpless epoxidation frequently have enantiomeric excesses above 90%.

The reaction product has 97% enantiomeric excess.

The reaction products (endo and exo) were found to be present in an enantiomeric excess of 50%.

The example below generates a chiral diosphenpol in 64% yield and 95% enantiomeric excess.

The enantiomeric excess of a substance is a measure of how pure it is.

The use of enantiomeric excess has established itself because of its historic ties with optical rotation.

As can be seen, high enantiomeric excesses are much readily attainable for the unreacted starting material.

In one interesting example, the use of circularly polarized light provided 3 in slight enantiomeric excess.

This has led to informal use the two terms as interchangeable, especially because optical purity was the traditional way of measuring enantiomeric excess.

This experimental catalyst was effective for enantioselective synthesis, achieving a modest 15% enantiomeric excess.

Enantiomeric excess or ee is a measure for how much of one enantiomer is present compared to the other.

The second strategy is asymmetric synthesis: the use of various techniques to prepare the desired compound in high enantiomeric excess.

Stereoselection that is higher or lower than the enantiomeric excess of the catalyst is considered non-ideal behavior.

Enantiomeric excess is defined as the absolute difference between the mole fraction of each enantiomer:

Enantiomeric excess is used as one of the indicators of the success of an asymmetric synthesis.

This experimental catalyst was employed in an asymmetric hydrogenation with a modest 15% enantiomeric excess.

In certain reactions which initially do not contain chiral information, stochastically distributed enantiomeric excess can be observed.

The use of chiral amine catalysts has allowed access to cycloaddition products in high enantiomeric excess.

In other words a small enantiomeric excess of left-handed amino acids may explain terrestrial life's preference for right-handed sugars.