Results 111 to 120 of about 511,953 (205)

Selective N‐Functionalization of Pyrazoles

European Journal of Organic Chemistry, EarlyView.
This review traces the evolution of regioselective N‐functionalization strategies for pyrazoles, a key class of nitrogen heterocycles widely used in medicinal chemistry. Due to rapid tautomerism, N‐functionalization often lacks selectivity, leading to poor and unpredictable regioisomeric outcomes.
Lucas Popek, Matthias Schrader, Christopher J. Teskey   +2 more
wiley   +1 more source

Kinetics of enzyme-catalysed desymmetrisation of prochiral substrates: product enantiomeric excess is not always constant. [PDF]

Beilstein J Org Chem, 2021
Halling PJ.
europepmc   +1 more source

Quantification of enantiomeric excess by H-1-detected heteronuclear refocusing and homonuclear multiple quantum NMR experiments

, 2011
The omega(1)-heterodecoupled-C-13-filtered proton detected NMR experiments are reported for the accurate quantification of enantiomeric excess in chiral molecules embedded in chiral liquid crystal.
Suryaprakash, N, Nath, Nilamoni, Nilamoni Nath, N. Suryaprakash   +3 more
core   +1 more source

Resolution Approaches Toward Enantiopure Planar Chiral 7‐bromo‐4‐hydroxy [2.2]paracyclophane

European Journal of Organic Chemistry, EarlyView.
This work describes access to both enantiomers of planar chiral 7‐bromo‐4‐hydroxy [2.2]paracyclophane through direct resolution of the racemate using an L‐isoleucine‐derived chiral auxiliary or through resolution of 4‐hydroxy [2.2]paracyclophane, followed by regioselective bromination.
Arthur Le Coz, Thomas Desclais, Fabien Le Cavelier, Jean‐François Lohier, Cyprien Lemouchi, Stéphane Perrio   +5 more
wiley   +1 more source

Selected Ion Monitoring Using Low-Cost Mass Spectrum Detectors Provides a Rapid, General, and Accurate Method for Enantiomeric Excess Determination in High-Throughput Experimentation. [PDF]

ACS Catal, 2022
Korch KM, Hayes JC, Kim RS, Sampson J, Kelly AT, Watson DA.   +5 more
europepmc   +1 more source

Coated and Immobilized Polysaccharides‐Based Stationary Phases for Planar Metallocenes Enantioseparation in Liquid Chromatography

ELECTROPHORESIS, EarlyView.
This study examined 21 new ferrocene and ruthenocene derivatives, including those with planar and central chirality. Their stereochemical behavior was examined using UV‐detected normal‐phase liquid chromatography. Under fixed conditions, eight polysaccharide‐based chiral stationary phases were tested using n‐heptane combined with either 2‐propanol or ...
Florine Wartelle, Rose Leblond, Lisa Bonin, Alina Ghinet, Emmanuelle Lipka   +4 more
wiley   +1 more source

One-pot analysis of enantiomeric excess of free amino acids by electrospray ionization mass spectrometry. [PDF]

RSC Adv, 2021
Nakakoji T, Sato H, Ono D, Miyake H, Mieda E, Shinoda S, Tsukube H, Kawasaki H, Arakawa R, Shizuma M.   +9 more
europepmc   +1 more source

Determination of enantiomeric excess using Raman optical activity

, 1995
A simple method for the determination of enantiomeric excess is described. It is based on depolarized Raman optical activity (ROA) measurements in right-angle scattering employing the incident ciruclar polarization (ICP) modulation approach. The accuracy
Barron, Laurence D., Lutz Hecht, Hecht, Lutz, Anthony L. Phillips, Phillips, Anthony L., Laurence D. Barron   +5 more
core   +1 more source

Lead‐free halide perovskites for efficient light‐emitting devices

FlexMat, EarlyView.
Overview of Lead‐free metal halide perovskites with different categories and optoelectronic application directions, including solid‐state lighting, light‐emitting diodes, piezoluminescence, flexible electronics, scintillators and CPL emitters. Abstract Lead halide perovskites exhibit promising optoelectronic properties for optoelectronic applications ...
Yueqi Shen, Kefan Meng, Yiqi Zhao, Chaoran Zhou, Jiaye Shu, Di Zhang, Chengqian Cao, Wanxin Chen, Yefeng Zhou, Weihua Ning   +9 more
wiley   +1 more source

Chiral discrimination and the measurement of enantiomeric excess from a severely overcrowded NMR spectrum

, 2013
NMR spectroscopic chiral visualization, unambiguous assignment of peaks pertaining to R and S enantiomers and the subsequent measurement of enantiomeric composition demands a highly resolved spectrum.
Suryaprakash, N, Chaudhari, Sachin Rama
core   +1 more source