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Diluted modified cyclodextrins as chiral stationary phases - influence of the polysiloxane solvent: Heptakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)-β-cyclodextrin

✍ Scribed by Dietrich, Armin ;Maas, Birgit ;Mosandl, Armin

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
619 KB
Volume
18
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

The influence of different polysiloxane solvents on the efficiency and stereoselectivity of columns coated with mixtures of heptakis (2,3‐di‐O‐acetyl‐6‐O‐tert‐butyldimethylsilyl)‐β‐cyclodextrin and the polysiloxanes was investigated. Generally, the enantioselectivity increased with decreasing polarity of the silicone solvent and/or increasing cyclodextrin concentration, with some exceptions. Thermodynamic investigations showed that a change of the diluting phase or the cyclodextrin concentration affects entropy as well as enthalpy differences between the diastereomeric cyclodextrin/solute complexes. As a consequence, a certain cyclodextrin/polysiloxane combination is superior to another only at a particular temperature.

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2,3-Di-O-pentyl-6-O-tert-butyldimethylsi
2,3-Di-O-pentyl-6-O-tert-butyldimethylsilyl-β-cyclodextrin as a Chiral Stationary Phase in Capillary Gas Chromatography
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2,3-Di-O-pentyl-6-O-tert-butyldimethylsilyl-b-cyclodextrin has been evaluated as an enantioselective stationary phase for capillary gas chromatography. Experimental results show a good enantioselectivity towards compounds with different functional groups (haloalkanes, alcohols, esters, terpenoids, a

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## Abstract Heptakis(2,3‐di‐__O__‐acetyl‐6‐__O__‐__tert__‐butyldimethylsilyl)‐β‐cyclo ‐dextrin proves to be a versatile chiral stationary phase for the direct differentiation of aroma‐relevant enantiomers.

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## Abstract The characteristics of the new chiral stationary phase heptakis(2,3‐di‐__O__‐methyl‐6‐__O__‐__tert__‐butyldimethylsilyl)‐β‐cyclodextrin are outlined and compared with permethyl‐ and perethyl‐β‐cyclodextrins.

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## Abstract Three new β‐cyclodextrin derivatives, heptakis(6‐__O__‐isopropyldi‐methylsilyl‐2,3‐di‐__O__‐ethyl)‐β‐cyclodextrin, heptakis(6‐__O__‐thexyldi‐methylsilyl‐2,3‐di‐__O__‐ethyl)‐β‐cyclodextrin, and heptakis(6‐__O__‐cy‐clohexyldimethyl‐2,3‐di‐__O__‐ethyl)‐β‐cyclodextrin (IPDE‐β‐CD, TXDE‐β‐CD,