Results 71 to 80 of about 23,430 (289)

Enantioselective Synthesis of Axially Chiral Diaryl Ethers via Rhodium‐Catalyzed [2 + 2 + 2] Cycloaddition

Angewandte Chemie, EarlyView.
An enantioselective rhodium‐catalyzed [2 + 2 + 2] cycloaddition enables the synthesis of axially chiral diaryl ethers. Carbonyl coordination ensures high reactivity and regioselectivity, affording products bearing up to four stereogenic axes with good enantio‐ and diastereoselectivity.
Yu Sato, Julong Jiang, Kairi Yamashiro, Ken Tanaka   +3 more
wiley   +2 more sources

Racemic methyl 3,10-dioxa-2-azatricyclo[6.2.1.02,6]undecane-4-carboxylate

Acta Crystallographica Section E, 2011
The structure of the racemic title compound, C10H15NO4, consists of a tricyclic skeleton comprising a six-membered piperidine ring and five-membered isoxazolidine and tetrahydrofuran rings. The piperidine ring adopts a distorted chair conformation, while
Basem A. Moosa, Atif Fazal, Shaikh A. Ali, Mohammed Fettouhi   +3 more
doaj   +1 more source

Potential of different techniques of preferential crystallization for enantioseparation of racemic compound forming systems

, 2009
Recently the feasibility of preferential crystallization for enantioseparation of racemic compound forming systems has been demonstrated (Lorenz et al., Application of preferential crystallization to resolve racemic compounds in a hybrid process ...
Andreas Seidel‐Morgenstern, Seidel-Morgenstern, A., Polenske, D., Heike Lorenz, Daniel Polenske, Lorenz, H.   +5 more
core   +1 more source

Conformational Transduction Amplification in a Biomimetic Polyelectrolyte for Ultrasensitive Imaging of Iron Metabolism

Advanced Science, EarlyView.
This work designs a peptide‐free polyelectrolyte with stable, switchable conformations and near‐infrared fluorescence in water. It harnesses a cooperative Fe3+‐triggered sheet‐to‐helix transition to generate nonlinear fluorescence quenching, enabling the ultrasensitive, real‐time visualization of Fe3+ ion distribution and metabolic trafficking at ...
Yeqiang Zhou, Danqi Yang, Yiwei Wang, Shuangyan Li, Fan Fan, Jiayu Zou, Cheng Zhang, Yang Liu, Hong Tan, Mingming Ding   +9 more
wiley   +1 more source

Diastereoselective Synthesis of 5-Hydroxy-8-methoxy-1-oxaspiro[5,5]undeca-7,10-diene-9-one

Molecules, 2013
A short five steps synthesis of the title compound from vanillin is described. The racemic spiroether 7 was obtained in 61% yield and in >99% diastereomeric excess (by 1H-NMR) from the corresponding phenolic derivative 3 by oxidation with lead (IV)
Thomas W. Scully, Guy L. Plourde
doaj   +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

Asymmetric Iron‐Catalyzed Vicinal C(sp3)─H Diamination of Carboxylic Acids

Angewandte Chemie, EarlyView.
An iron‐catalyzed vicinal α,β‐C(sp3)─H diamination of readily available carboxylic acids furnishes chiral α,β‐diamino acids in a single pot with high regio‐, diastereo‐, and enantioselectivity (up to >20:1 dr and >99% ee). ABSTRACT The direct construction of chiral 1,2‐diamines through the stereoselective functionalization of two vicinal C(sp3)─H bonds
Bing Zhou, Yuan Zheng, Xiulan Xie, Marcel Hemming, Sergei I. Ivlev, Eric Meggers   +5 more
wiley   +2 more sources

Crystal structure of β-d,l-fructose

Acta Crystallographica Section E: Crystallographic Communications, 2015
The title compound, C6H12O6, was crystallized from an aqueous solution of equimolar mixture of d- and l-fructose (1,3,4,5,6-pentahydroxyhexan-2-one, arabino-hexulose or levulose), and it was confirmed that d-fructose (or l-fructose) formed β-pyranose ...
Tomohiko Ishii, Tatsuya Senoo, Akihide Yoshihara, Kazuhiro Fukada, Genta Sakane   +4 more
doaj   +1 more source

Comparison between the crystal structures of racemic and enantiopure aryl benzyl sulfoxides. [PDF]

RSC Adv
In literature reports about the comparison between the crystal structures of racemic and enantiopure compounds, minor differences have been observed between the conformations of an enantiopure compound and the conformations of the same enantiomer when ...
Capozzi MAM, Alvarez-Larena A, Piniella Febrer JF, Cardellicchio C.   +3 more
europepmc   +2 more sources

Phase diagram of a chiral substance exhibiting oiling out. 2. Racemic compound forming ibuprofen in water

, 2012
This work investigates the ternary phase behavior of the two enantiomers of ibuprofen and water. The two enantiomers crystallize as a racemic compound and exhibit a thermodynamically stable liquid-liquid phase separation (LLPS), which extends over the ...
Bäbler, Matthäus U.,, Mazzotti, M., Codan, L., Casillo, S.   +3 more
core   +1 more source