In stereochemistry, enantiomeric excess (ee) is a measurement of purity used for chiral substances. It reflects the degree to which a sample contains...

rotation (α) of a sample of a compound can be used to quantify the enantiomeric excess of that compound, provided that the specific rotation ([α]) for the...

demonstrated that even larger enantiomeric excesses may be produced by abiotic pathways. To identify chiral asymmetry (enantiomeric excess) of biological origin...

nitrosobenzene. In this system, a small enantiomeric excess of catalyst leads to a large enantiomeric excess of product. Serine octamer clusters are also...

use of various techniques to prepare the desired compound in high enantiomeric excess. Techniques encompassed include the use of chiral starting materials...

subunits and reaction centers, yielding less than 10 percent in enantiomeric excess.[5] The catalyst discovered by Yian Shi is derived from D-fructose...

formed in a substrate molecule and which produces the stereoisomeric (enantiomeric or diastereomeric) products in unequal amounts." Put more simply: it...

and triazolium salts. Triazolium salts were found to give greater enantiomeric excess than thiazolium salts. An example is shown below. Since the products...

or a chiral reagent. The degree of selectivity is measured by the enantiomeric excess. An important variant is kinetic resolution, in which a pre-existing...

enantioenriched or heterochiral when its enantiomeric ratio is greater than 50:50 but less than 100:0. Enantiomeric excess or e.e. is the difference between...

of a chiral drug. Other synonyms employed include enantiomeric excess, enantiomer purity, enantiomeric purity, and optical purity. Optical purity is an...

Soai reaction, have the property that they can amplify a very small enantiomeric excess into a large one. In another example, sodium chlorate crystallizes...

(The starting material is not enantiopure but the retention of enantiomeric excess suggests that the auxiliary directs the cyclization.) Tius's allenyl...

different chemical properties of the racemic starting materials. The enantiomeric excess (ee) of the unreacted starting material continually rises as more...

non‐racemic mixtures of their enantiomers. There are methods to increase enantiomeric excess (optical purity) of verbenol and to isolate individual enantiomers...

in combined birth control pills Expressed emotion, in psychology Enantiomeric excess, in chemistry Ethoxyethyl ethers, a protecting group in chemistry...

alcohol with a high enantiomeric excess based on the major enantiomer of the alkane that was used. Even a slight enantiomeric excess of the alkane is rapidly...

based chiral phospholidines; new agents for the determination of the enantiomeric excess of chiral alcohols, amines and thiols by means of 31P NMR". Tetrahedron:...

nonzero enantiomeric excess is under at least partial kinetic control. (In many stoichiometric asymmetric transformations, the enantiomeric products...

"Synthesis of highly epimerizable N-protected _-amino aldehydes of high enantiomeric excess". Tetrahedron Lett. 41: 1359. doi:10.1016/S0040-4039(99)02293-5....

and then calculate the ratio of the two anomers present from the enantiomeric excess, as long as one knows the rotation of each pure anomer. One can monitor...

(2022-07-12). "On the origins of life's homochirality: Inducing enantiomeric excess with spin-polarized electrons". Proceedings of the National Academy...

polymers. The development of an enantioselective (i.e. yielding an enantiomeric excess, which is labelled as "ee") variant of the Johnson–Corey–Chaykovsky...

aldehydes are not suitable Michael acceptors and have markedly decreased enantiomeric excess in such reactions. Another limitation encountered with intramolecular...

directions of rotation (partially or completely) to produce a product in enantiomeric excess. Correlation diagrams, which connect the molecular orbitals of the...

Once established, chirality would be selected for. A small bias (enantiomeric excess) in the population can be amplified into a large one by asymmetric...

yield of a kinetic resolution process cannot be higher than 50%, the enantiomeric excess approaches 100% in some reactions. The Sharpless epoxidation is viable...

of these substituted binaphthyls, shown below, gave 92% product enantiomeric excess in the addition of allyltributyltin to aldehydes with a Ti(OiPr)2Cl2...

a ball mill in a mechanosynthesis. The reaction product has 97% enantiomeric excess. A reaction rate acceleration is observed in several systems when...

effective for enantioselective synthesis, achieving a modest 15% enantiomeric excess. Knowles was also the first to apply enantioselective metal catalysis...