Chromogenic Charge Transfer Cleft-Type Tetrahydrobenzoxanthene Enantioselective Receptors for Dinitrobenzoylamino Acids
摘要:
A combination of a benzoxanthene cleft-type receptor with an electron-rich aromatic ring capable of establishing charge-tranfer interactions provides enantioselective receptors for dinitrobenzoylamino acids. Racemic mixtures of the receptor can be resolved with TLCs impregnated with the guest. The structure of the complexes has been established in an X-ray study. Enantiomeric amino acids provide complexes with different colors.
Direct Resolution of Optically Active Isomers on Chiral Packings Containing Ergoline Skeletons. 5. Enantioseparation of Amino Acid Derivatives
作者:A. Messina、A. M. Girelli、M. Flieger、M. Sinibaldi、P. Sedmera、L. Cvak
DOI:10.1021/ac950698c
日期:1996.4.1
alkaloid-based chiral stationary phase preparation is described. Synthesis is based on bonding the allyl derivative of terguride to mercaptopropylsilanized silica gel. The packing exhibits higher content of chiral selector, stability, reproducibility, and enantioselectivity toward amino acids compared to that previously studied. The chromatographic behavior of amino acids with different side chains and substituent
Continuous Separation of Racemic 3,5-Dinitrobenzoyl-Amino Acids in a Centrifugal Contact Separator with the Aid of Cinchona-Based Chiral Host Compounds
作者:Andrew J. Hallett、Gerard J. Kwant、Johannes G. de Vries
DOI:10.1002/chem.200800797
日期:2009.2.16
Resolution through revolution: It is possible to extract 3,5‐dinitrobenzoyl‐protected amino acids enantioselectively with the aid of a table‐top centrifugalcontactseparator and a catalytic amount of a chiral host compound based on the Cinchona alkaloids. Enantioselectivities of up to 80 % could be reached in a single pass. This allows the development of a process for the continuous separation of
Improvement of chiral separation efficiency through temperature control during one time high performance liquid chromatography analysis
作者:Dan Bi Eun、Young Han Jeong、Jae Jeong Ryoo
DOI:10.1002/chir.23444
日期:2022.7
study examined how manual temperature control affects the separation of two enantiomers of five racemic mixtures using high-performance liquidchromatography (HPLC) in terms of separation factor (α), resolution (Rs), and the number of theoretical plates (N). The results showed that heating/cooling during one time HPLC analysis improved the separation factor and resolution.
Chiral stationary phases based on derivatives of 4-amino-3,5-dinitrobenzoic acid
申请人:——
公开号:US20040144708A1
公开(公告)日:2004-07-29
The invention describes new chiral stationary phases containing a 4-amino-3,5-dinitrobenzoic unit modified with chiral groups and spacer groups. The invention includes the process for the perparation of said stationary phases starting from 4-halogenated derivative of 3,5-dinitrobenzoic acid, chiral selectors obtainable as intermediates in the aforesaid process, and the use of the chiral stationary phases in the separation of enantiomers.