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Solving the Elution Problem

To solve the above problem, the following conversion of the equation was performed. Since the ester (S,-X) is the enantiomer of ester (R,X), their NMR data should be identical (5(R,X) = (5(S,-X). Therefore, A<> = 5 R,X - d S,X) = d S,-X) -d S,X] = d(2nd fr.) - <)( 1st fr.). So, the absolute configuration X of the first-eluted fraction can be determined from the Art value which is obtained by subtracting the chemical shift of the first-eluted fraction from that of the second-eluted frac-... [Pg.305]

In the field of anion analysis, ion-pair chromatography is a significant alternative to ion-exchange chromatography. If a co-elution of two anions is suspected with one of the two methods, it is often possible to solve the separation problem with the other method two different compounds rarely show the same retention behavior under completely different chromatographic conditions. [Pg.409]

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Elution problem

Problem solving

The elution problem

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