Volume 21, Issue 9 pp. 809-817
Regular Article/Proceedings from the 20th International Symposium on Chirality, Geneva, Switzerland, 2008

NMR enantiodifferentiation of quaternary ammonium salts of Tröger base

Christophe Michon

Christophe Michon

Department of Organic Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland

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Maria-Héléna Gonçalves-Farbos

Maria-Héléna Gonçalves-Farbos

Department of Organic Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland

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Jérôme Lacour

Corresponding Author

Jérôme Lacour

Department of Organic Chemistry, University of Geneva, CH-1211 Geneva 4, Switzerland

Département de Chimie Organique, Université de Genève, Quai Ernest Ansermet 30, CH-1211 Genève 4, SwitzerlandSearch for more papers by this author
First published: 22 January 2009
Citations: 31

Abstract

Hexacoordinated phosphorus BINPHAT anion 1 is an efficient NMR chiral solvating agent for quaternary ammonium cations (quats) derived from Tröger base leading to large separations of the proton signals of the enantiomers and even in polar solvent media such as CD3CN (ΔΔδ up to 0.12 ppm). Quite surprisingly, this efficacy in the NMR split efficiency is not translated into a supramolecular stereocontrol (Pfeiffer effect) of the cation configuration by the anion. Chirality 2009. © 2009 Wiley-Liss, Inc.

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