Results 241 to 250 of about 667,303 (272)

Measurement of Enantiomeric Excess by Kinetic Resolution and Mass Spectrometry

Angewandte Chemie International Edition, 1999
New applications for your mass spectrometer-use it to measure enantiomeric excess! The enantiomeric content of very small quantities of chiral alcohols and amines has been determined by derivatization with chiral acylating agents in which mass is correlated to absolute configuration.
Jianhua, Guo, Jiangyue, Wu, Gary, Siuzdak, M G, Finn   +3 more
openaire   +2 more sources

Catalyst–substrate helical character matching determines enantiomeric excess

Tetrahedron, 2005
Abstract In the framework of a helix theory recently developed for molecular chiralities and chiral interactions, it is further proposed that for an asymmetric reaction to be highly enantioselective, the helical characters, that is, the local energies of electrons on the helices, of the catalyst and the substrate complexed with it in the ...
openaire   +1 more source

π-Stacking Induced NMR Spectrum Splitting in Enantiomerically Enriched Ru(II) Complexes:  Evaluation of Enantiomeric Excess

Inorganic Chemistry, 2005
Several chiral octahedral complexes of the general formula [Ru(bpy)2 (Lig)][PF6]2 (Lig = a ligand that can participate in pi-stacking interactions such as eilatin, isoeilatin, and tpphz) were synthesized in both the racemic and enantiomerically pure/enriched forms.
Sheba D, Bergman, Moshe, Kol
openaire   +2 more sources

Enantiomeric Excess of a Cruciferous Phytoalexin, Spirobrassinin, and Its Enantiomeric Enrichment in an Achiral HPLC System

Journal of Natural Products, 2000
Enantiomeric purity of a cruciferous phytoalexin, spirobrassinin (1), was determined by chiral HPLC analysis. The enantiomeric excesses of two natural spirobrassinin fractions separated by nonchiral chromatography were considerably different. A significant enantiomeric enrichment was observed during the nonchiral chromatographic separation of an ...
K, Monde, N, Harada, M, Takasugi, P, Kutschy, M, Suchy, M, Dzurilla   +5 more
openaire   +2 more sources

High-throughput assay for determining enantiomeric excess of chiral diols, amino alcohols, and amines and for direct asymmetric reaction screening

Nature Protocols, 2020
E. Shcherbakova, T. James, P. Anzenbacher   +2 more
semanticscholar   +1 more source

NMR methods for determination of enantiomeric excess.

Enantiomer, 2002
With the dramatic recent growth in importance of asymmetric syntheses, new applications or approaches for analyses of enantiomeric excess (% e.e.) of samples continue to become more essential. Nuclear magnetic resonance (NMR) spectroscopy provides a wide range of powerful methods which are complementary to chromatographic or electrophoretic-based ...
openaire   +1 more source

enantiomeric excess

Catalysis from A to Z, 2020

semanticscholar   +1 more source

Enhancement of Enantiomeric Excess by Ligand Distortion

Journal of the American Chemical Society, 2001
K B, Lipkowitz, S, Schefzick, D, Avnir
openaire   +2 more sources

EMDee:  An Enzymatic Method for Determining Enantiomeric Excess

Journal of the American Chemical Society, 2001
P, Abato, C T, Seto
openaire   +2 more sources

100% Enantiomeric Excess

2023
openaire   +1 more source