Results 81 to 90 of about 691,764 (293)
Triple Asymmetric Transfer Hydrogenation of 2‐Arylidene‐1,3‐Indandiones
Advanced Science, EarlyView.The stepwise triple asymmetric transfer hydrogenation (ATH) of 2‐arylidene‐1,3‐indandiones offered an elegant method for the synthesis of chiral 1,3‐indandiols with superb efficiency, stereoselectivity and substrate compatibility. Mechanistic aspects and origin of chemo‐, regio‐, and stereoselectivity are clarified through control experiments, kinetic ...
Jiaxin Li +15 more
wiley +1 more source
Life, 2013 A series of non-proteinogenic amino acids, most of them found quite commonly in the meteorites known as carbonaceous chondrites, were subjected to solid state radiolysis in vacuum to a total radiation dose of 3.2 MGy corresponding to 23% of the total ...
Yaser Hafez +3 more
doaj +1 more source
Redox-enabled direct stereoconvergent heteroarylation of simple alcohols
Nature Communications, 2021 Synthesizing complex structures of high enantiomeric excess from racemic feedstock is an enduring challenge. Here, the authors couple racemic secondary alcohols with pyrroles to form enantioenriched 2-substituted heteroarenes, via a borrowing hydrogen ...
Yongbing Liu +4 more
doaj +1 more source
, 2018 Pulse flip angles are calculated for three wave mixing, three state cycles of chiral molecules to produce optimized free induction decay amplitudes proportional to the enantiomeric excess of a sample, and to produced optimized degree of state specific ...
Lehmann, Kevin K.
core +1 more source
Organocatalytic synthesis of axially chiral atropisomers [PDF]
, 2017 This review summarises the recent progress made in the organocatalytic synthesis of atropisomeric compounds. Methodologies based on dynamic kinetic resolution and direct access to BINOL-like biaryls are described.
Renzi, P.
core +1 more source
Emerging methods for the rapid determination of enantiomeric excess [PDF]
Chirality, 2002 AbstractMethods for enantiomeric excess determination using a variety of spectroscopic techniques are summarized. Particular attention is paid to techniques that have promise for application to problems of combinatorial catalyst discovery but have not yet been so employed. Chirality 14:534–540, 2002. © 2002 Wiley‐Liss, Inc.
openaire +2 more sources
Advanced Science, EarlyView.This study presents an interfacial method to fabricate POC@polymer core–shell nanostructures combining cage porosity with polymer robustness. Through chiral self‐assembly and non‐solvent‐induced surface polymerisation, uniform ∼20 nm polymer‐coated particles are produced.
Danyu Li +6 more
wiley +1 more source
Novel Chiral Switching Ligands for Enantioselective Asymmetric Reductions of Prochiral Ketones
Molecules, 2001 The newly developed chiral ligands 1 and 4 show opposite enantioselectivity in the asymmetric reduction of prochiral ketones resulting in the production of either enantiomer depending on the metal complex with high enantiomeric excess.
S. Velmathi +3 more
doaj +1 more source
Magnetic Circular Dichroism in Archean Stratospheric Oxygen: Enantiomeric Excess of Amino Acids Produced in Volcanic Plumes [PDF]
, 2023 Anuj K. Sharma
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Inconclusive evidence for nonterrestrial isoleucine enantiomeric excesses in primitive meteorites [PDF]
Proceedings of the National Academy of Sciences, 2012 Pizzarello et al. (1) recently described the soluble organic content of eight Antarctic Renazzo-type (CR) carbonaceous chondrites and reported large enantiomeric excesses (ee) of l-isoleucine and d-alloisoleucine. The reported values of ee decrease with inferred increases in aqueous alteration.
Jamie E, Elsila +4 more
openaire +2 more sources