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E. Optical Purity (Enantiomeric Excess) When dealing with a pair of enantiomers,
it is essential to have a means of describ— ing the composition of that mixture
and the degree to which one enantiomer is in excess relative to its mirror image.
William Brown, Brent Iverson, Eric Anslyn, 2013
In the past, optical purity was often equated with enantiomeric excess, but the
latter has taken on a slightly different meaning with the advent of modern
methods that allow the physical separation of enantiomers by chromatography
and the ...
Marye Anne Fox, James K. Whitesell, 2004
3
Enantiomeric Separations on Cyclodextrin-based and Synthetic ...
greatly. Although Cyclobond I-2000 RSP CSP was not able to separate the
enantiomers of compound 6, the enantiomeric separation was improved for this
compound on Cyclobond I- 2000 DM CSP compared with compounds 5 and 7 (
Fig. 5).
4
Enantiomeric Separations and Microorganism Studies with ...
This dissertation is divided into two parts: Part I involves enantiomeric
separations by high performance liquid chromatography (HPLC) and capillary
electrophoresis (CE); Part II describes a series of microorganism studies using
CE. In Part I ...
5
Enantiomeric Separations of Natural Compounds and Metal ...
Molly Melissa Warnke. CHAPTER 1 INTRODUCTION 1.1 THESIS
ORGANIZATION High performance liquid chromatography (HPLC) and
electrospray ionization mass spectrometry (ESI-MS) are two very important
methods used in analytical ...
Molly Melissa Warnke, 2008
6
Modern Physical Organic Chemistry
In the laboratory today, all enantiomeric excesses that we exploit ultimately
derive from natural materials. Whether it is the interaction with an
enantiomerically pure amino acid from a natural source, or an individual
manually separating ...
Eric V. Anslyn, Dennis A. Dougherty, 2006
The first method is enantiomeric resolution. As noted in the introduction to this
chapter, enantiomers have identical chemical and physical properties, but
diastereomers have different properties. As a result, techniques such as
crystallization ...
8
Principles and Applications of Stereochemistry
If the racemate of the compound whose enantiomeric excess is being determined
is not available, then it is possible to use the racemate of the chiral derivatizing
agent with an enantiomerically pure sample of the compound of interest instead,
...
9
Stereochemistry of Organic Compounds: Principles and ...
... either enantiomer of a chiral solvent such as 2-chlorooctane thus causing
partial resolution. Chiral crown ethers, previously discussed, can similarly be
used to trap enantiomeric cations. These methods, however, are of little practical
use.
10
Advanced Organic Chemistry: Part A: Structure and Mechanisms
The extent of enantiomeric purity can be controlled by controlling the degree of
conversion. As the extent of conversion increases, the enantiomeric purity of the
unreacted enantiomer increases.10 The relationship between the relative rate of
...
Francis A. Carey, Richard J. Sundberg, 2007
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Copper catalysis overcomes double bond trouble
... the DTBM-SEGPHOS copper complex, producing an amine in 34% yield and 98% enantiomeric excess (ee), much to Buchwald's excitement. «Royal Society of Chemistry, 七月 15»
Getting the measure of Mars
If there's no enantiomeric excess, that would mean it's a bit boring, probably statistical. If there is a strong preference, what causes this break in ... «Royal Society of Chemistry, 七月 15»
Using MicroCal PEAQ-ITC Automated Systems in Drug Discovery …
Figure 5 shows the biphasic binding isotherm, demonstrating how the ITC information may appear when the enantiomeric ligand mixture is ... «News-Medical.net, 五月 15»
Harnessing haemoproteins
Optimizing the conditions enabled Fasan and co-workers to get an enantiomeric excess of 49%. Furthermore, it was shown that the variant ... «Nature.com, 三月 15»
Asymmetrical organocatalysis
By understanding how asymmetric organocatalysis works, we can understand how to utilize it in the synthesis of enantiomeric compounds. «The Manitoban, 三月 15»
Using the MicroCal PEAQ-ITC Instruments to Address the Needs of …
MicroCal iTC200 data for the titration of enantiomeric compound into target protein (client-provided data). The binding isotherm is clearly ... «Azom.com, 三月 15»
The smell of success
Confusingly, we can smell the differences between some enantiomeric pairs, but not others. 'The combined odour seemed to have come from a ... «Royal Society of Chemistry, 二月 15»
Planet Formation and the Origin of Life
The most pristine meteorites also revealed large (up to 60%) natal enantiomeric excesses (molecules that are mirror images of one another). «The Planetary Society, 二月 15»
ACQUITY UPC2 System and Columns
More than that, compounds that are often a challenge to separate by any other means such as structural analogues, isomers, and enantiomeric ... «Labmate Online, 一月 15»
Design and enantioselective synthesis of new Cashmeran odorants
These two so-called enantiomeric forms can cause characteristic differences when binding to olfactory receptors. "In order to obtain all four of ... «Phys.Org, 一月 15»
