## Abstract Complex mixtures of partially alkylated cyclodextrins can be analyzed by both HPLC and high temperature capillary GC. Because of the limited efficiency of LC, suitable analytical and preparative separations can be achieved only with systems of carefully optimized selectivity. Using LC i
Preparation, purification, and analysis of alkylated cyclodextrins
✍ Scribed by Schomburg, Gerhard ;Deege, Alfred ;Hinrichs, Heike ;Hübinger, Eduard ;Husmann, Heribert
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 473 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0935-6304
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✦ Synopsis
Abstract
Methods of alkylation of α‐, β‐ and γ‐cyclodextrins have been optimized with regard to the parameters of reaction, degree of alkylation and yields. The analysis of the reaction mixtures and of the isolated single species has been performed by high temperature GC and HPLC. The phase systems of the preferably applied HPLC have been carefully adjusted by variation of both the stationary and mobile phases to the very different hydrophobicities of the various alkylated CD species which have been synthesized. Several partially or fully alkylated CD species were isolated from preparative scale HPLC separations in high purity.
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Multicurie amounts of propane-T, have been obobtained with typical yields of ca. 30% from the reaction of C3H8 with excess T2 over a Ni catalyst. The mass spectrometric analysis of the reaction product purified by preparative glc gave the following distribution: C3H8 16 mol%, C3H7T 13 mol%, C3HsT2 2
## Abstract Selectively alkylated cyclodextrins have been used to resolve the enantiomers of 2,2′ alkylated biphenyls. The configurational stability of 2,2′‐dimethyl and 2,2′‐diethyl biphenyls is insufficient for gas chromatographic separation even at ambient temperature. 2‐Isopropyl‐2′‐__t__‐butyl
## Abstract Selectively alkylated and acylated cyclodextrin derivatives are suitable stationary phases for capillary GC. To obtain a closer insight into the separation mechanism, an inverse substituted cyclodextrin derivative was synthesized and characterized, and its chiral selectivity was compare