GC Separation of Enantiomers of Alkyl Esters of 2-Bromo Substituted Carboxylic Acids Enantiomers on 6-TBDMS-2,3-di-alkyl- β- and γ-Cyclodextrin Stationary Phases
作者:Ivan Špánik、Darina Kačeriaková、Jan Krupčík、Daniel Wayne Armstrong
DOI:10.1002/chir.22310
日期:2014.6
The gas chromatographic separation of enantiomers of 2‐Br carboxylic acid derivatives was studied on four different 6‐TBDMS‐2,3‐di‐O‐alkyl‐ β‐ and ‐γ‐CD stationary phases. The differences in thermodynamic data ΔH and –ΔS} for the 15 structurally related racemates were evaluated. The influence of structure differences in the alkyl substituents covalently attached to the stereogenic carbon atom, as
在4种不同的6-TBDMS-2,3-di-O-烷基-β-和γ-CD固定相上研究了2-Br羧酸衍生物对映体的气相色谱分离。热力学数据的差异 ΔH和–ΔS}对15个与结构相关的外消旋体进行了评估。详细研究了共价连接到立体碳原子上的烷基取代基以及同源分析物的酯基中结构差异的影响,以及改性β-和γ-环糊精衍生物的选择性。环糊精空腔的大小,以及6-TBDMS-β-CD的2和3位的烷基取代基的延伸,也影响了它们的选择性。对映体分离的质量主要受分子酯基团的烷基链影响,这似乎与所用的CD固定相无关。在某些情况下,分离是由于外部吸附而不是与手性选择剂形成包合物而发生的。手性26:279–285,2014。©2014 Wiley Periodicals,Inc.