Results 41 to 50 of about 33,103 (197)

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

Assignment-free chirality detection in unknown samples via microwave three-wave mixing

Communications Chemistry, 2022
Identification of chiral molecules in multi-component mixtures of unknown compositions remains a challenge. Here, the authors show that microwave three-wave mixing that uses broad-spectrum fields can detect chiral molecules in enantiomeric excess without
Greta Koumarianou, Irene Wang, Lincoln Satterthwaite, David Patterson   +3 more
doaj   +1 more source

Imaging Active Infection in vivo Using D-Amino Acid Derived PET Radiotracers. [PDF]

, 2017
Occult bacterial infections represent a worldwide health problem. Differentiating active bacterial infection from sterile inflammation can be difficult using current imaging tools. Present clinically viable methodologies either detect morphologic changes
Blecha, Joseph E, Flavell, Robert R, Kwak, Tiffany, Mutch, Christopher A, Neumann, Kiel D, Ohliger, Michael A, Rosenberg, Oren S, Sriram, Renuka, VanBrocklin, Henry F, Villanueva-Meyer, Javier E, Wilson, David M   +10 more
core   +1 more source

Chiroptical activity of hydroxycarboxylic acids with implications for the origin of biological homochirality

Communications Chemistry, 2021
Enantiomerically-enriched hydroxycarboxylic acids have been found in meteorites, but the possible origin of this asymmetry has not been explored experimentally.
Jana Bocková, Nykola C. Jones, Uwe J. Meierhenrich, Søren V. Hoffmann, Cornelia Meinert   +4 more
doaj   +1 more source

Transferring Axial Molecular Chirality Through a Sequence of On-Surface Reactions

, 2020
Fine management of chiral processes on solid surfaces has progressed over the years, yet still faces the need for the controlled and selective production of advanced chiral materials.
Berdonces-Layunta, Alejandro, Castro-Esteban, Jesús, Colazzo, Luciano, de Oteyza, Dimas G., Lawrence, James, Merino-Díez, Néstor, Mohammed, Mohammed S. G., Pascual, J. Ignacio, Peña, Diego   +8 more
core   +1 more source

Estimation of Enantiomeric Excess Based on Rapid Host–Guest Exchange

Chemosensors, 2021
Chiral molecules possess enantiomers that have non-superimposable chemical structures but exhibit identical nuclear magnetic resonance (NMR) spectra.
Jan Labuta, Shinsuke Ishihara, Daniel T. Payne, Kazuyoshi Takimoto, Hisako Sato, Lenka Hanyková, Katsuhiko Ariga, Jonathan P. Hill   +7 more
doaj   +1 more source

Phosphoramidite Gold(I)-Catalyzed Diastereo- and Enantioselective Synthesis of 3,4-Substituted Pyrrolidines [PDF]

, 2011
In this article the utility of phosphoramidite ligands in enantioselective AuI catalysis was explored in the development of highly diastereo- and enantioselective AuI-catalyzed cycloadditions of allenenes.
Benitez, Diego, Goddard, William A., III, González, Ana Z., Tkatchouk, Ekaterina, Toste, F. Dean   +4 more
core   +3 more sources

Stability toward High Energy Radiation of Non-Proteinogenic Amino Acids: Implications for the Origins of Life

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, Giancarlo Angelini, Franco Cataldo, Susana Iglesias-Groth   +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, Ran Tao, Zhi-Keng Lin, Guoqiang Yang, Yu Zhao   +4 more
doaj   +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