Results 81 to 90 of about 89,874 (280)

Forging Fluorine-Containing Quaternary Stereocenters by a Light-Driven Organocatalytic Aldol Desymmetrization Process [PDF]

, 2017
Reported herein is a light-triggered organocatalytic strategy for the desymmetrization of achiral 2-fluoro-substi- tuted cyclopentane-1,3-diketones.
Ametamey, Balaraman, Banik, Beeson, Borissov, Brak, Brimioulle, Brunet, Dell'Amico, Dell'Amico, Eagan, Eder, Erb, Ford, Hajos, Hamashima, Hepburn, Hintermann, Ishimaru, Jeschke, Jiang, Kalow, Kalow, Katcher, Katcher, Klán, Kwiatkowski, Lozano, Ma, Marigo, Müller, Nakamura, O'Hagan, Partridge, Prakash, Prévost, Purser, Rauniyar, Reisman, Saadi, Sammes, Steiner, Taylor, Woerly, Yang, Yang, Yang, Zeng, Zhu, Zuend   +49 more
core   +2 more sources

A multi-enzymatic cascade reaction for the stereoselective production of γ-oxyfunctionalyzed amino acids

Frontiers in Microbiology, 2016
A stereoselective three-enzyme cascade for synthesis of diasteromerically pure γ-oxyfunctionalized α-amino acids was developed. By coupling a dynamic kinetic resolution using an N-acylamino acid racemase and an L-selective aminoacylase from Geobacillus ...
Junichi eEnoki, Jaqueline eMeisborn, Ann-Christin eMüller, Robert eKourist   +3 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

Asymmetrisch-Selektive Polymerisation von Nicht-Olefinischen Monomeren

CHIMIA, 1972
Among the various methods of preparing optically active polymers the so-called asymmetric-selective (stereoelective) polymerization of racemic monomers is particularly attractive.
H.G. Bührer
doaj   +1 more source

How Long can Left and Right Handed Life Forms Coexist?

, 2004
Reaction-diffusion equations based on a polymerization model are solved to simulate the spreading of hypothetic left and right handed life forms on the Earth's surface.
Brandenburg, Axel, Multamäki, Tuomas
core   +2 more sources

racemic

, 2014
Citation: 'racemic' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.R05026 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms. Requests for commercial usage
openaire   +1 more source

Maize tricin-oligolignol metabolites and their implications for monocot lignification [PDF]

, 2016
Lignin is an abundant aromatic plant cell wall polymer consisting of phenylpropanoid units in which the aromatic rings display various degrees of methoxylation.
Boerjan, Wout, del Río, José Carlos, Lan, Wu, Lu, Fachuang, Morreel, Kris, Ralph, John, Rencoret, Jorge, Vermerris, Wilfred, Voorend, Wannes   +8 more
core   +2 more sources

Enantioselective Extraction of Ofloxacin Enantiomers Using Ester Alcohol L-Tartarate as Chiral Selector [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2009
The distribution behavior of ofloxacin enantiomers was examined in the aqueous and organic solvent of a two-phase system containing chiral selector L-tartarate.
Xiaoqing Chen Feipeng Jiao, Xinyu Jiang
doaj  

(2RS,4′RS)-3′-(3-Chloro-4-methoxyphenyl)-4′-phenyl-4′H-spiro[indene-2,5′-isoxazol]-1(3H)-one ethanol monosolvate

Acta Crystallographica Section E, 2011
The title compound, C23H17ClN2O3·C2H6O, is the stoichiometric 1:1 ethanol solvate of a racemic reaction product, which forms a conglomerate. The refined Flack parameter of 0.36 (3) indicates racemic twinning.
Adil Boughaleb, Hafid Zouihri, Said Gmouh, Abdelali Kerbal, Mohamed El yazidi   +4 more
doaj   +1 more source

Chiral polymerization: symmetry breaking and entropy production in closed systems

, 2011
We solve numerically a kinetic model of chiral polymerization in systems closed to matter and energy flow, paying special emphasis to its ability to amplify the small initial enantiomeric excesses due to the internal and unavoidable statistical ...
Avetisov, Avetisov, Blanco, Blocher, Brandenburg, Brandenburg, Brandenburg, Celia Blanco, Chaikin, Cross, Crusats, David Hochberg, De Greef, Frank, Gleiser, Gleiser, Gleiser, Gleiser, Goldanski, Guijarro, Hitz, Hitz, Hochberg, Illos, Kondepudi, Kondepudi, Kondepudi, Mauksch, Mills, Mislow, Nery, Plasson, Ribó, Ross, Rubinstein, Rubinstein, Saito, Sandars, Scott, Siegel, Stier, Stier, Wattis, Wattis, Weissbuch, Weissbuch   +45 more
core   +1 more source