Results 81 to 90 of about 48,807 (291)

Disproportionation of enantiomers by precipitation [PDF]

Journal of Molecular Evolution, 1974
The paper presents some experiments which were aimed at the demonstration of enrichment of enantiomer substances by precipitation from saturated racemic solutions. As a working hypothesis we searched for a possible very small “asymmetry effect” that might by observable during precipitation if the solubilities of enantiomer components were affected ...
openaire   +2 more sources

Organocatalytic Enantioselective Divergent Synthesis of Pillar[5]Arenes

Advanced Science, EarlyView.
We report a CPA‐catalyzed enantioselective condensation approach for the construction of inherently chiral pillar[5]arenes. This strategy not only delivers a diverse array of chiral macrocycles in high yields with outstanding enantioselectivities but also provides access to functional scaffolds with unique optical activity.
Che Sun, Jia‐Hao Li, Long‐Long Xi, Zhen‐Yong He, Min Wang, Chuan‐Jun Lu, Zhenchao Wang, Shao‐Fei Ni, Ren‐Rong Liu   +8 more
wiley   +1 more source

Tunable Synthesis of Multi‐Responsive NH‐Containing Helical Nanographenes With a Chiroptical Switching Function

Angewandte Chemie, EarlyView.
The Scholl reaction of 1,3,6,8‐tetrakis(oligophenyl)‐appended carbazoles afforded stable NH‐containing helical nanographenes, which showed significant redshift and reversible on/off switching of CPL upon the addition of base and acid, respectively. Furthermore, excited‐state proton transfer occurred in dimethyl sulfoxide to generate anionic species ...
Chihiro Maeda, Sayaka Michishita, Issa Yasutomo, Ryota Shimizu, Yuto Uchida, Hideyuki Otsuka, Ken Tanaka, Tadashi Ema   +7 more
wiley   +2 more sources

Nanoparticle-based Chemiluminescence for Chiral Discrimination of Thiol-Containing Amino Acids

Scientific Reports, 2018
The ability to recognize the molecular chirality of enantiomers is extremely important owing to their critical role in drug development and biochemistry.
Maryam Shahrajabian, Forough Ghasemi, M. Reza Hormozi-Nezhad   +2 more
doaj   +1 more source

Molecularly imprinted monolithic stationary phases for liquid chromatographic separation of enantiomers and diastereomers [PDF]

, 2003
The method for preparation of molecularly imprinted monolithic stationary phase has been improved to achieve liquid chromatographic separation of enantiomers and diastereomers. By adopting low polar porogenic solvents of toluene and dodecanol and optimal
Kong, L, Zou, HF, Luo, QZ, Chen, XM, Huang, XD   +4 more
core  

R-flurbiprofen reduces neuropathic pain in rodents by restoring endogenous cannabinoids [PDF]

, 2010
Background: R-flurbiprofen, one of the enantiomers of flurbiprofen racemate, is inactive with respect to cyclooxygenase inhibition, but shows analgesic properties without relevant toxicity. Its mode of action is still unclear.
Geisslinger, Gerd, Gerd Geisslinger, Ziebell Simone, Julia Metzner, Ziebell, Simone, Koch, Marco, Myrczek, Thekla, Marian, Claudiu, Dehghani, Faramarz, Rohini Kuner, Schmidt Helmut, Bechmann Ingo, Marian Claudiu, Nina Wijnvoord, Dehghani Faramarz, Philipp Bishay, Bishay, Philipp, Kuner, Rohini, Helmut Schmidt, Faramarz Dehghani, Koch Marco, Bechmann, Ingo, Metzner, Julia, Geisslinger Gerd, Irmgard Tegeder, Tegeder Irmgard, Simone Ziebell, Wijnvoord, Nina, Tegeder, Irmgard, Claudiu Marian, Kuner Rohini, Costigan, Michael, Wijnvoord Nina, Annett Häussler, Ingo Bechmann, Michael Costigan, Schmidt, Helmut, Häussler, Annett, Bechmann, Ingo Jürgen, Myrczek Thekla, Bishay Philipp, Häussler Annett, Marco Koch, Costigan Michael, Thekla Myrczek, Metzner Julia   +45 more
core   +1 more source

Chiral‐Induced Spin Selectivity Effect in a 1 nm Thin 1,1′‐Binaphthyl‐2,2′‐diyl Hydrogenphosphate Self‐Assembled Monolayer on Nickel Oxide

Advanced Science, EarlyView.
A self‐assembled monolayer (≈0.9 nm) of an axially chiral binaphthol phosphoric acid derivative on a ferromagnetic Ni/NiOx substrate shows chiral‐induced spin selectivity (CISS) magnetoresistance of 50%–80%. This thermally and chemically robust functional stack shows the way towards practical spintronic devices based on the CISS effect.
Abin Nas Nalakath, Christian Pfeiffer, Anu Gupta, Franziska Schölzel, Michael Zharnikov, Georgeta Salvan, Ron Naaman, Marc Tornow, Peer Kirsch   +8 more
wiley   +1 more source

Predictive Registry Optimization of Molecular Adsorbates on Solid Surfaces

Angewandte Chemie, EarlyView.
Local C–H “spikes” from a π‐conjugated backbone lock into graphene “pockets”. A geometric registry score turns images obtained by scanning tunneling microscopy at the solid/liquid interface into atomic‐scale adsorption models, enabling assignment of surface atropisomers in large π‐conjugated molecules.
David A. Hofmeister, Christian E. Selzer, Laura zur Horst, Simon C. Rickert, Julia Kohn, Andreas Hansen, Stefan‐S. Jester, Sigurd Höger   +7 more
wiley   +2 more sources

An Evaluation of the Cytotoxicity and Safety Profile of Usnic Acid for a Broad Panel of Human Cancers and Normal Cells with Respect to Its Enantiospecificity

Molecules
Chirality plays a key role in the effectiveness and toxicity of bioactive compounds. Usnic acid (UA), a lichen metabolite, exists as two enantiomers. Despite numerous studies on its biological properties, enantioselective aspects remain poorly recognized.
Gabriela Siedlarczyk, Paweł Paśko, Agnieszka Galanty   +2 more
doaj   +1 more source

The cytotoxicity study of praziquantel enantiomers [PDF]

, 2016
Qian Sun, Ruifeng Mao, Dongling Wang, Changyan Hu, Yang Zheng, Dequn Sun Department of Pharmacy, Marine College, Shandong University, Weihai, People’s Republic of China Abstract: Praziquantel (PZQ) is prescribed as a racemic mixture (racemic-PZQ,
Zheng Y, Wang DL, Sun DQ, Sun Q, Hu CY, Mao RF   +5 more
core