Results 61 to 70 of about 511,953 (205)

New methods for the enantiomeric excess determination using NMR [PDF]

, 1994
The synthesis of enantiomerically pure compounds is an important objective of the organic chemistry. Especially in the field of medicine and pesticides, mostly one enantiomer is responsible for the biological activity.
Hulst , Anthony Jacques Ronald Lambert,, Hulst, Anthony Jacques Ronald Lambert   +1 more
core   +17 more sources

Ultracold amplification proposal for parity violation in chiral molecules

Physical Review Research
We propose a theoretical mechanism to indirectly detect the small parity-violating energy difference (PVED) between chiral enantiomers through a macroscopic enantiomeric excess observed in an ultracold gas.
Daniel Martínez-Gil, Pedro Bargueño, Salvador Miret-Artés   +2 more
doaj   +1 more source

Enantioselective desymmetrization of cyclohexadienones via an intramolecular Rauhut–Currier reaction of allenoates

Nature Communications, 2016
The Rauhut-Currier reaction is a powerful method to form carbon-carbon bonds. Here, the authors report an enantioselective intramolecular variant between alkenes and allenoates, giving access to highly functionalised bicyclic lactones in excellent ...
Weijun Yao, Xiaowei Dou, Shan Wen, Ji’en Wu, Jagadese J. Vittal, Yixin Lu   +5 more
doaj   +1 more source

Hydroformylation of Vinylferrocene with Rhodium and Platinum Catalysts

CHIMIA, 1986
2- and 3-ferrocenylpropionaldehydes (2 and 3) have been prepared by highly regioselective hydroformylation of vinylferrocene (1) using rhodium and platinum catalysts.
László Kollár, Barbara Floris, Piero Pino   +2 more
doaj   +1 more source

Pattern-Based Recognition for Determination of Enantiomeric Excess, Using Chiral Auxiliary Induced Chemical Shift Perturbation NMR

, 2010
A protocol for the determination of enantiomeric excess of chiral carboxylic acid, using the subtle frequency shifts (chemical shift perturbation) in NMR spectra induced by chiral auxiliary, is described.
Zhang, Anjiang, Chen, Xiaojing, Yu, Xiaochun, Ding, Lisheng, Lei, XX, Wenzhou Univ, Coll Chem & Mat Engn, Wenzhou 325035, Peoples R China, Lei, Xinxiang, Liu, Lu   +6 more
core  

High-Throughput Screening of Identity, Enantiomeric Excess, and Concentration Using MLCT Transitions in CD Spectroscopy

, 2016
High-Throughput Screening of Identity, Enantiomeric Excess, and Concentration Using MLCT Transitions in CD ...
Hyunwoo Kim (690467), Jik Chin (2062858), Eric V. Anslyn (1349271), Sonia Nieto (2172232), Vincent M. Lynch (1578592)   +4 more
core   +2 more sources

Visualization of enantiorecognition by excited-state conformation modulation

Nature Communications
Chiral purity is crucial in life sciences, emphasizing the importance of precise enantiomeric identification and the development of analytical techniques.
Zizhao Huang, Ying Hu, Jie Sun, Zhenyi He, Tao Jiang, He Tian, Xiang Ma   +6 more
doaj   +1 more source

Calcium(II)-mediated resolution of methyl o-chloromandelate with chiral O,O′-dibenzoyltartaric acid in preparative scale

Main Group Metal Chemistry, 2019
We report here the coordination-mediated resolution of methyl o-chloromandelate, which is a key intermediate for clopidogrel, in preparative scale. The reaction of CaO, optically pure (2R, 3R)-O,O′-dibenzoyltartaric acid, and methyl o-chloromandelate in ...
Xu Hong-Wu, Wu Li-Huan, Ren Qiang, Liu Cui-Yu, Yan Guan-Qing   +4 more
doaj   +1 more source

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

CALB Immobilized onto Magnetic Nanoparticles for Efficient Kinetic Resolution of Racemic Secondary Alcohols: Long-Term Stability and Reusability

Molecules, 2019
In this study, an immobilization strategy for magnetic cross-linking enzyme aggregates of lipase B from Candida antarctica (CALB) was developed and investigated. Magnetic particles were prepared by conventional co-precipitation.
Xiu Xing, Jun-Qi Jia, Jing-Fan Zhang, Zi-Wen Zhou, Jun Li, Na Wang, Xiao-Qi Yu   +6 more
doaj   +1 more source