Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines

Mehdizadeh A, Letzel M, Klaes M, Agena C, Mattay J (2004)
EUROPEAN JOURNAL OF MASS SPECTROMETRY 10(1): 649-655.

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Abstract
The interaction of inherently chiral resorc[4]arenes with different chiral ammonium ions was measured by electrospray ionization mass spectrometry. For this purpose, one enantiomer of the ammonium guests was labeled with deuterium to distinguish the enantiomers by their mass. We synthesized the ammonium salts by the reaction of chiral primary amines with either CH3I or CD3I and analyzed the resulting ammonium iodides by nuclear magnetic resonance and optical rotation. The complexation experiments were performed by mixing the chiral host with various ratios of the unlabeled guest and its labeled enantiomer. By analyzing the integrals of the host-guest complexes, we observed a chiral discrimination effect and a secondary isotope effect as well.
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Mehdizadeh A, Letzel M, Klaes M, Agena C, Mattay J. Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines. EUROPEAN JOURNAL OF MASS SPECTROMETRY. 2004;10(1):649-655.
Mehdizadeh, A., Letzel, M., Klaes, M., Agena, C., & Mattay, J. (2004). Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines. EUROPEAN JOURNAL OF MASS SPECTROMETRY, 10(1), 649-655.
Mehdizadeh, A., Letzel, M., Klaes, M., Agena, C., and Mattay, J. (2004). Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines. EUROPEAN JOURNAL OF MASS SPECTROMETRY 10, 649-655.
Mehdizadeh, A., et al., 2004. Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines. EUROPEAN JOURNAL OF MASS SPECTROMETRY, 10(1), p 649-655.
A. Mehdizadeh, et al., “Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines”, EUROPEAN JOURNAL OF MASS SPECTROMETRY, vol. 10, 2004, pp. 649-655.
Mehdizadeh, A., Letzel, M., Klaes, M., Agena, C., Mattay, J.: Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines. EUROPEAN JOURNAL OF MASS SPECTROMETRY. 10, 649-655 (2004).
Mehdizadeh, A, Letzel, Matthias, Klaes, M, Agena, C, and Mattay, Jochen. “Chiral discrimination on the host-guest complexation of resorc[4]arenes with quarternary amines”. EUROPEAN JOURNAL OF MASS SPECTROMETRY 10.1 (2004): 649-655.
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Cyclochiral resorcin[4]arenes as effective enantioselectors in the gas phase.
Fraschetti C, Letzel MC, Paletta M, Mattay J, Speranza M, Filippi A, Aschi M, Rozhenko AB., J Mass Spectrom 47(1), 2012
PMID: 22282092

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