Results 61 to 70 of about 5,957 (202)
SeparationsThis review systematically summarizes the novel preparation methods of cyclodextrin-based chromatographic stationary phases and their applications for chiral recognition in separation techniques such as capillary gas chromatography and high-performance ...
Wenlanqi Du +4 more
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Química Nova, 1997 The importance of chromatographic separation of enantiomers has been acknowledged. This review surveys the development, application and perspectives of polysaccharide carbamates as chiral stationary phase for HPLC.
Quezia B. Cass +4 more
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Chemosensors, 2021 The new configurationally stable, unsymmetrical 2,12-diaza[6]helicene was synthesized as a racemate and the enantiomers were separated in an enantiopure state by semi-preparative HPLC on chiral stationary phase.
Francesca Fontana +7 more
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Current trends in the development of polymer‐based monolithic stationary phases
Analytical Science Advances, 2022 This review focuses on the development and applications of organic polymer monoliths, with special attention to the literature published in 2021. The latest protocols in the preparation of polymer monoliths are discussed.
Martina Nechvátalová, Jiří Urban
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, 2014 Citation: 'chiral stationary phase' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.CT06920 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms. Requests for
openaire +1 more source
Angewandte Chemie International Edition, EarlyView.An air‐stable, easily prepared, bifunctional Cu(II)/imidazolium complex enables highly enantioselective α‐alkylation of 1,3‐dicarbonyls with outstanding productivity (TON up to 1740). Highlights include broad electrophile scope spanning π‐activated and nonactivated reagents, stereo‐retentive allylation, simple catalyst synthesis, and efficient catalyst
Johanna Haußmann +8 more
wiley +1 more source
Overcrowded Alkene Photo‐Redox‐Switches Based on Quinolinium/Carbene Building Blocks
Angewandte Chemie International Edition, EarlyView.A modular synthesis of a new class of photo‐ and redox‐switches is described based on the combination of quinolinium salts and carbenes. Photochemical switching allows to selectively switch between folded E/Z isomers, while electrochemical switching allows to change between neutral, radical cation and dicationic oxidation states, which are all isolable
Chris Burdenski +10 more
wiley +1 more source
Dynamic Control of Nucleic Acids Self‐Assembly and Expression Using Photoswitches
Chemistry – A European Journal, EarlyView.We review here the recent progress made in the design of molecular photoswitches, and highlight their implementation for the dynamic control over nucleic acids self‐assembly and expression. ABSTRACT Synthetic nucleic acids have become readily available and now constitute versatile building blocks in materials science—where they can be used to engineer ...
Noemí Nogal +4 more
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Chemistry – A European Journal, EarlyView.Aminocatalytically generated isobenzofulvenes and 3‐oxidopyridinium betaines act as ambiphilic reaction partners in orbital‐symmetry‐allowed [10+4] cycloadditions or formally symmetry‐forbidden concerted thermal [10+6] cycloadditions. The reaction furnishes three cycloadducts: one [10+4] cycloadduct and two regioisomeric [10+6] cycloadducts.
Jonas Faghtmann +7 more
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Chemistry – A European Journal, EarlyView.Quinolin‐4‐ones were converted to chloroquinolinium salts, allowing formation of axially chiral aminoquinolinium salts via an enantioretentive SNAr reaction with a variety of amine nucleophiles. The salts have a high rotational barrier, with a racemization half‐life of ∼1000s of years.
Darren Holmes +5 more
wiley +1 more source