Results 71 to 80 of about 33,103 (197)

Chiral and Molecular Recognition through Protonation between Aromatic Amino Acids and Tripeptides Probed by Collision-Activated Dissociation in the Gas Phase

Molecules, 2018
Chiral and molecular recognition through protonation was investigated through the collision-activated dissociation (CAD) of protonated noncovalent complexes of aromatic amino acid enantiomers with l-alanine- and l-serine-containing tripeptides using a ...
Akimasa Fujihara, Hikaru Inoue, Masanobu Sogi, Michiko Tajiri, Yoshinao Wada   +4 more
doaj   +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

Generation of amine dehydrogenases with increased catalytic performance and substrate scope from ε-deaminating L-Lysine dehydrogenase

Nature Communications, 2019
Amine dehydrogenases (AmDHs) catalyse the conversion of ketones into amines. Here, the authors created AmDH variants, the best of which showing a substrate-dependent stereo-switchable selectivity, affording either S- or R-configured amine products with ...
Vasilis Tseliou, Tanja Knaus, Marcelo F. Masman, Maria L. Corrado, Francesco G. Mutti   +4 more
doaj   +1 more source

Homochirality and the need of energy

, 2009
The mechanisms for explaining how a stable asymmetric chemical system can be formed from a symmetric chemical system, in the absence of any asymmetric influence other than statistical fluctuations, have been developed during the last decades, focusing on
A Ben-Naim, A Brandenburg, A Brandenburg, A Giaquinta, A Pérez-Madrid, Axel Brandenburg, C Huber, C Viedma, C Viedma, D Blackmond, D Hochberg, D Kondepudi, D Kondepudi, DG Blackmond, DG Blackmond, DG Blackmond, DK Kondepudi, DK Kondepudi, F Faglioni, F Kipping, FC Frank, G Lente, GD Cody, J Crusats, J Crusats, J Crusats, JD Farmer, JL Bada, JL Bada, JM Cruz, JM McBride, JS Siegel, K Asakura, K Asakura, K Asakura, K Soai, M Avalos, M Bellac Le, M Eigen, M Gleiser, M Gleiser, M Lahav, M Mauksch, M Mauksch, M Mauksch, N Wagner, O Abramov, P Curie, PM Masters, PW Voorhees, R Pagni, R Plasson, R Plasson, R Plasson, R Plasson, R Plasson, Raphaël Plasson, RH Swendsen, S Chandrasekhar, SF Mason, SK Lin, SK Lin, T Gánti, T Hitz, T Multamäki, TL Hill, WA Bonner, WL Noorduin, WL Noorduin, Y Saito, Y Saito   +70 more
core   +1 more source

Diffusion Enhances Chirality Selection

, 2006
Diffusion effect on chirality selection in a two-dimensional reaction-diffusion model is studied by the Monte Carlo simulation. The model consists of achiral reactants A which turn into either of the chiral products, R or S, in a solvent of chemically ...
D. Kondepudi, D. Stauffer, Hiroyuki Hyuga, M. Le Bellac, R. B. Stinchcombe, Ryo Shibata, W. A. Bonner, Yukio Saito   +7 more
core   +1 more source

Stereodivergent, Diels-Alder-initiated organocascades employing α,β-unsaturated acylammonium salts: scope, mechanism, and application. [PDF]

, 2017
Chiral α,β-unsaturated acylammonium salts are novel dienophiles enabling enantioselective Diels-Alder-lactonization (DAL) organocascades leading to cis- and trans-fused, bicyclic γ- and δ-lactones from readily prepared dienes, commodity acid chlorides ...
Abbasov, Mikail E, Hudson, Brandi M, Romo, Daniel, Tantillo, Dean J   +3 more
core   +2 more sources

Determination of enantiomeric excess of carboxylates by fluorescent macrocyclic sensors

Chemical Science, 2016
Chiral fluorescent macrocycles enable detection of carboxylate enantiomers using naked eye, which allows for quantitative measurement of the enantiomeric excess with high accuracy (error < 1.6%).
Akdeniz, Ali, Minami, Tsuyoshi, Watanabe, Sagiri, Yokoyama, Maki, Ema, Tadashi, Anzenbacher, Pavel   +5 more
openaire   +3 more sources

Biotransformations of Substituted Phenylethanols and Acetophenones by Environmental Bacteria

Food Technology and Biotechnology, 2008
Whole cells of hydrocarbon-degrading bacteria, isolated from polluted sediments in the Santos Estuary (Baixada Santista, São Paulo, Brazil), were able to catalyse oxidoreduction reactions with various substituted phenylethanols and acetophenones as ...
Edna Kagohara, Vivian Helena Pellizari, João Valdir Comasseto, Leandro Helgueira Andrade, André Luiz Meleiro Porto   +4 more
doaj  

Solubility of chiral species as function of the enantiomeric excess [PDF]

Journal of Pharmacy and Pharmacology, 2015
Abstract The solubility of racemizable and nonracemizable chiral species is discussed in terms of: enantiomeric excess, nature of solvent and the solid phases, which are in equilibrium with a saturated solution. Stable and metastable equilibria are contemplated by an extensive used of phase diagrams.
openaire   +3 more sources

Click chemistry enables quantitative chiroptical sensing of chiral compounds in protic media and complex mixtures

Nature Communications, 2018
Chiroptical sensing in complex mixtures remains a challenging task. Here, the authors report an efficient coumarin probe for chiroptical click chirality sensing of absolute configuration, concentration and enantiomeric excess of several compound classes.
F. Yushra Thanzeel, Kaluvu Balaraman, Christian Wolf   +2 more
doaj   +1 more source