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Article . 2018
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Journal of Separation Science
Article . 2018 . Peer-reviewed
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Chiral separation of helical chromenes with chloromethyl phenylcarbamate polysaccharide‐based stationary phases

Authors: Ianni, Federica; Scorzoni, Stefania; Gentili, Pier Luigi; Di Michele, Alessandro; Frigoli, Michel; Camaioni, Emidio; Ortica, Fausto; +1 Authors

Chiral separation of helical chromenes with chloromethyl phenylcarbamate polysaccharide‐based stationary phases

Abstract

AbstractTwo chloromethyl phenylcarbamate‐based chiral stationary phases, one containing an amylose‐type chiral selector (Lux Amylose 2, from Phenomenex) and the other a cellulose‐type one (Lux Cellulose‐4, from Phenomenex), were successfully used for the chiral resolution of three helical chromenes featuring a helicene‐like structure. The compound bearing a phenyl substituent on the helicene‐like structure was enantioresolved at 25°C with Lux Cellulose‐4 and a n‐hexane/1‐propanol 99:1 v/v eluent. With a n‐hexane/2‐propanol 99.8:0.2 v/v mobile phase, the same column (operated at 35°C) provided the separation of the four isomers of the compound having a hexyl residue on the helicene‐like motif and an additional asymmetric carbon. Lux Amylose‐2 was necessary for the enantioseparation of the compound having the sole hexyl residue on the helical scaffold. For the last compound a n‐hexane/2‐propanol 99.8:0.2 v/v eluent was used, and the column temperature was fixed at 5°C. The enantiomer elution order was appraised by using electronic circular dichroism and theoretical calculations. Notably, different thermodynamics of retention and enantioseparation were observed for molecules with pronounced structural similarity, that is, the enantiomer pairs of the compound containing the additional asymmetric carbon atom. Indeed, both entropically and enthalpically controlled adsorption and separation processes were observed.

Country
France
Keywords

[CHIM] Chemical Sciences, [CHIM]Chemical Sciences

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
17
Top 10%
Top 10%
Top 10%
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