Results 31 to 40 of about 75,340 (210)

Enantioselective synthesis of non-proteinogenic 2-arylallyl-α-amino acids via Pd/In catalytic cascades [PDF]

, 2006
An efficient synthesis of both R- and S-enantiomers of 2-arylallyl-α-amino acids via a diastereoselective Pd/In mediated catalytic allylation of chiral N-sulfinyl-α-imino esters is described.
Anwar, Anwar, Cleghorn, Cleghorn, Colin Kilner, Colin W.G. Fishwick, Cooper, Cooper, Cooper, Davis, Ellman, Ellman, Evans, Grigg, Grigg, Hodgson, Hohsaka, John Blacker, Kevin Bailey, Najera, Ronald Grigg, Shaun McCaffrey, Stewart Korn, Visuvanathar Sridharan   +23 more
core   +1 more source

Chiral separation by enantioselective liquid–liquid extraction [PDF]

, 2011
The literature on enantioselective liquid–liquid extraction (ELLE) spans more than half a century of research. Nonetheless, a comprehensive overview has not appeared during the past few decades.
Feringa, Ben L.,, Heeres, Hero J.,, Minnaard, Adriaan J.,, Schuur, Boelo,, Verkuijl, Bastiaan J.V.,, Vries, Johannes G. de,   +5 more
core   +3 more sources

Polysaccharide- and β-Cyclodextrin-Based Chiral Selectors for Enantiomer Resolution: Recent Developments and Applications

Molecules, 2021
Polysaccharides, oligosaccharides, and their derivatives, particularly of amylose, cellulose, chitosan, and β-cyclodextrin, are well-known chiral selectors (CSs) of chiral stationary phases (CSPs) in chromatography, because they can separate a wide range
Cuong Viet Bui, Thomas Rosenau, Hubert Hettegger   +2 more
doaj   +1 more source

Determination of Optical Purity of Lactic Acid-Based Chiral Liquid Crystals and Corresponding Building Blocks by Chiral High-Performance Liquid Chromatography and Supercritical Fluid Chromatography

Molecules, 2019
Liquid crystals (LCs) are among the most prominent materials of the current information age, mainly due to their well-known application in liquid crystal displays (LCDs).
Anna Poryvai, Terezia Vojtylová-Jurkovičová, Michal Šmahel, Natalie Kolderová, Petra Tomášková, David Sýkora, Michal Kohout   +6 more
doaj   +1 more source

Enantioselective Chromatography: an Essential and Versatile Tool for the Analytical and Preparative Separation of Enantiomers

CHIMIA, 1997
Chromatography on chiral stationary phases and electrophoresis in the presence of chiral selectors have become essential tools for the determination of enantiomeric purity in connection with synthesis and with biological studies of chiral ...
Eric R. Francotte
doaj   +2 more sources

Estimating chiral selector potential of micelle-based mobile phases through the analysis of some enantiomeric mixtures

Journal of Taibah University for Science, 2021
The present work aims to present two new concepts concerned with chiral separation. First, chiral separation of some enantiomeric drugs, using micelle-based liquid chromatography without any chiral selector, whether in the stationary phase or the mobile ...
M. E. K. Wahba, D. El Sherbiny, D. El Wasseef   +2 more
doaj   +1 more source

Kinetic Resolution in Asymmetric Epoxidation using Iminium Salt Catalysis [PDF]

, 2013
The first reported examples of kinetic resolution in epoxidation reactions using iminium salt catalysis are described, providing up to 99% ee in the epoxidation of racemic cis ...
Allin, Steven M., Appleby, Louise F., Buckley, Benjamin R., Bulman Page, Philip C., Chan, Yohan, Day, David P., Mckenzie, Michael J., Slawin, Alexandra M. Z.   +7 more
core   +1 more source

Asymmetric Electrophilic alpha-Amidoalkylation, VII1): Generation, Crystal Structure, and Trapping Reactions of a Chiral 6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline Derived N-Acyliminium Ion [PDF]

, 1990
The camphanic acid amide 4 has efficiently been oxidized with triphenylcarbenium tetrafluoroborate (3) to yield the chiral N-acyliminium ion 1. Trapping reactions of 1 with the silyl nucleophiles 7a-c and 10a-f proceeded with stereoselective bond ...
Aledesanmi, Brossi, Brossi, Huber, Kametani, Nagasaka, Onda, Palasz, Shono, Stupnikova, Wanner, Wanner, Wanner, Wanner, Yamato, Zaugg   +15 more
core   +1 more source

Mining Chromatographic Enantioseparation Data Using Matched Molecular Pair Analysis

Molecules, 2016
We apply matched molecular pair (MMP) analysis to data from ChirBase, which contains literature reports of chromatographic enantioseparations. For the 19 chiral stationary phases we examined, we were able to identify 289 sets of pairs where there is a ...
Robert P. Sheridan, Patrick Piras, Edward C. Sherer, Christian Roussel, William H. Pirkle, Christopher J. Welch   +5 more
doaj   +1 more source

Characterisation of the Metabolites of 1,8-Cineole Transferred into Human Milk: Concentrations and Ratio of Enantiomers

Metabolites, 2013
1,8-Cineole is a widely distributed odorant that also shows physiological effects, but whose human metabolism has hitherto not been extensively investigated.
Frauke Kirsch, Andrea Buettner
doaj   +1 more source