A versatile ternary ionic complex for chiral discrimination of molecules with diverse functionalities using 1H NMR?

New Journal of Chemistry Pub Date: 2014-06-26 DOI: 10.1039/C4NJ00417E

Abstract

This study reports a simple, efficient and versatile protocol developed for NMR spectroscopic enantiodiscrimination of molecules containing diverse functional groups, such as amino alcohols, secondary alcohols, cyanohydrins, oxazolidones, diols, thiones and epoxides, using a phosphorous based three component mixture. The simple mixing and shaking of enantiopure 1,1′-binaphthyl-2,2′-diyl hydrogenphosphate (BNPA), 4-(dimethylamino)pyridine (DMAP) and a chiral analyte in the solvent CDCl3 served as a chiral solvating agent and resulted in well dispersed peaks for each enantiomer in the 1H NMR spectrum. Discrimination could be achieved not only for the proton at the chiral centre, but also for multiple proton sites. The devised approach also permitted the precise measurement of the enantiomeric excess (ee).

Graphical abstract: A versatile ternary ionic complex for chiral discrimination of molecules with diverse functionalities using 1H NMR
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