Enantiomeric Separation Of Epoxides By Gas Chromatography Using Derivatized Beta Cyclodextrin As Stationary Phase
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Author | : |
Publisher | : |
Total Pages | : |
Release | : 2004 |
Genre | : Cyclodextrins |
ISBN | : 9789741761289 |
Download Enantiomeric Separation of Epoxides by Gas Chromatography Using Derivatized Beta-cyclodextrin as Stationary Phase Book in PDF, Epub and Kindle
Eanatiomeric separations of aromatic epoxides were studied by means of capillary gas chromatography using heptakis(2,3,di-O-methyl-6-O-tert-butyldi methylisilyl)cyclomaltoheptaose (or BSiMe) and heptakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsiloyl)cyclomaltoheptaose (or BSiAc) as chiral stationary phases. The effects of substitution types and position of styrene oxide derivatives on retention and enantioselectivity have been investigated. Thermodynamic data on the interaction of enantiomers with chiral stationary phases were collected in detail in order to clarify the strength of analyte-stationary phase interaction and enantioselectivity towards the selected groups of epoxides. All eposides with different substitution type and position were successfully separated with either BSiMe or BSiAc, or otherwise both of them. On both columns, the number, type, and position of analyte substitution have a strong influence on enantioselectivity. The type of substituent on cyclodextrin molecule (BSiMe vs.BSiAc) also affect enatioselectivity of epoxides greatly. Both columns can be used to compliment one another as their resolving abilities are quite opposite.
Author | : Nadnudda Rodthongkum |
Publisher | : |
Total Pages | : 262 |
Release | : 2005 |
Genre | : Cyclodextrins |
ISBN | : 9789745325036 |
Download Enantiomeric Separation of Phenoxy Acid Methyl Esters by Gas Chromatography Using Derivatized Beta-cyclodextrins as Stationary Phases Book in PDF, Epub and Kindle
Author | : Weiyong Li |
Publisher | : |
Total Pages | : 138 |
Release | : 1991 |
Genre | : |
ISBN | : |
Download Enantiomeric Separation by Capillary Gas Chromatography Using Derivatized Cyclodextrin Stationary Phases Book in PDF, Epub and Kindle
Author | : Pattama Changseeplag |
Publisher | : |
Total Pages | : 238 |
Release | : 2002 |
Genre | : Cyclodextrins |
ISBN | : 9789741718962 |
Download Enantiomeric Separation of Esters by Gas Chromatography Using Derivatized Bata-cyclodextrins as Stationary Phases Book in PDF, Epub and Kindle
Enantiomeric separations of some esters were studied by means of capillary gas chromatography using heptakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl) cyclomaltoheptaose (or BSiMe) and heptakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)cyclomaltoheptaose (or BSiAc) as stationary phases. The influence of analyte structure, e.g. the type and position of substituent together with ester chain length, on retention and enantioselectivity was systematically investigated. Thermodynamic data were also calculated in order to clarify the strength of analyte-stationary phase interaction and enantioselectivity towards these selected groups of esters. All esters with different substitution patterns were successfully separated with either BSiMe or BSiAc, or otherwise both of them. Generally, BSiAc phase exhibited greater enantioselectivity towards most analytes than BSiMe phase. From chromatographic and thermodynamic data obtained, it can be concluded that the structure of ester analytes plays an important role on separation. In most cases, the interaction of these two phases towards esters slightly increased with lengthening alkyl chain while enantioselectivity significantly decreased. Also, changing the position of substituent or chiral center caused changes in the interaction and enantioselectivity. Moreover, the degrees of interaction strength and sites as well as enantioselectivity of these esters depended upon the size and polarity of substituents.
Author | : Wilfried A. König |
Publisher | : |
Total Pages | : 184 |
Release | : 1992 |
Genre | : Science |
ISBN | : |
Download Gas Chromatographic Enantiomer Separation with Modified Cyclodextrins Book in PDF, Epub and Kindle
Author | : Ornuma Konghuirob |
Publisher | : |
Total Pages | : 216 |
Release | : 2004 |
Genre | : Alcohol |
ISBN | : 9789745314641 |
Download Enantiomeric Separation of Alcohols by Gas Chromatography Using Cyclodextrin Derivatives as Stationary Phases Book in PDF, Epub and Kindle
Enantiomeric separations of 70 alcohols were studied by means of capillary gas chromatography using heptakis(2,3-di-O-¬methyl-6-O-tert-butyldimethylsilyl)cyclomaltoheptasose (or BSiMe) and octakis(2,3-di-O-¬methyl-6-O-tert-butyldimethylsilyl)cyclomaltooctaose (or GSiMe) as chiral stationary phases. The influence of analyte structure, e.g. the type and position of substituent, alcohol chain length, the position of chiral center, and main-structure of alcohols, on retention and enantioselectivity was systematically investigated. Thermodynamic data were also calculated to clarify the strength of analyte-stationary phase interaction and enantioselectivity towards the selected group of alcohols. All of alcohols studied, except for 35F and 2oct, were successfully separated with either BSiMe or GSiMe, or both of them. Generally, BSiMe phase exhibited grater enantioseparation towards most analytes than GSiMe phase. On both columns, the structure of alcohol analytes plays an important role on separation. Changing the position of substituent or chiral center causes changes in the interaction and enantioselectivity. The type and size of substituent also significantly affect enantioselectivity. In addition to the analyte structure, the size of cyclodextrin molecules greatly affects enantioselectivity.
Author | : Stig G. Allenmark |
Publisher | : Ellis Horwood |
Total Pages | : 296 |
Release | : 1991 |
Genre | : Science |
ISBN | : |
Download Chromatographic Enantioseparation Book in PDF, Epub and Kindle
Author | : Wilfried A. König |
Publisher | : |
Total Pages | : 128 |
Release | : 1987 |
Genre | : Chirality |
ISBN | : |
Download The Practice of Enantiomer Separation by Capillary Gas Chromatography Book in PDF, Epub and Kindle
Author | : Edward A. Mularz |
Publisher | : |
Total Pages | : 184 |
Release | : 1988 |
Genre | : Cyclodextrins in pharmaceutical technology |
ISBN | : |
Download Investigation of the Factors Affecting the Separation of Enantiomers Using Beta-cyclodextrin Mobile Phases in High Performance Liquid Chromatography Book in PDF, Epub and Kindle
Author | : Yubing Tang |
Publisher | : |
Total Pages | : 198 |
Release | : 1993 |
Genre | : |
ISBN | : |
Download Enantiomeric Separation Via Chromatography Using Cyclodextrin Stationary Phases Book in PDF, Epub and Kindle