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By Peter Schreier

For readers not less than reasonably acquainted with the speculation of reading unstable aroma compounds, an advent to the big variety of recommendations for reading chiral molecules. They contain chiroptical tools akin to polarimetry, optical rotation dispersion and round dichroism; liquid, fuel, large

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Extra resources for Analysis of Chiral Organic Molecules: Methodology and Applications

Example text

Early attempts to develop such devices have been described in the literature [45,46]. -Ievel problem. If the identity of the substance is known and only one isomer is present, then the sign of the rotation easily estab­ lishes its stereochemical identity, in which case polarimetric detection is sufficient. If both enantiomers are present, which is normally the case, the analysis takes on a different dimension; one has to detet:mine the ee value or optical purity. Polarimetry is the best choice to determine the enantiomeric enrichment at the ex­ ploratory level, where eluted volumes are small.

In recent years the application of these techniques has become more and more significant to analytical chemistry. Among the various requirements of analytical methodologies the properties of analytical selectivity and breadth of application are of prime importance. Analytical selectivity depends on the structural properties of the analyte and the ability of the selected detector to differentiate between the analyte and a potentially high number of interfering compounds. The optimum number of molecular properties necessary to achieve an acceptable level of selectivity appears to be two.

The octant distribution of the signs was determined semi-empirically by means of various calculations and a large number of collected data. The 'octant rule' cannot be applied to 2,3-unsaturated ketones. In this case, the experimentally confirmed heHcity rule is valid. 4 The 'octant rule' of saturated ketones. (a) All eight octants, (b) the four rear octants with the sign of the CD effect. Nonetheless, the number and relative importance of chromophore-bond interactions makes the assessment of electronic chirality uncertain.

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