Results 71 to 80 of about 10,075 (214)
Light‐Induced Anion Translocation to Control Helical Folding in an Artificial Communication System
Chemistry – A European Journal, EarlyView.Anion‐induced helical folding of an oligomer is controlled indirectly and reversibly by light through anion uptake/release by a photoresponsive receptor. Thus, a light signal is processed into a chemical signal in a communication‐type three‐component supramolecular system.
Indigo M. Bekaert +5 more
wiley +1 more source
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
wiley +1 more source
Nature Communications, 2018 Chiroptical sensing in complex mixtures remains a challenging task. Here, the authors report an efficient coumarin probe for chiroptical click chirality sensing of absolute configuration, concentration and enantiomeric excess of several compound classes.
F. Yushra Thanzeel +2 more
doaj +1 more source
Rapid Enantiomeric Excess Measurements of Enantioisotopomers by Molecular Rotational Resonance Spectroscopy. [PDF]
Org Process Res Dev, 2023 Sonstrom RE +5 more
europepmc +1 more source
Breaking the Mold: Electrophilic Hydrophosphanation Emerges
Chemistry – A European Journal, EarlyView.Electrophilic hydride attack on the olefin, instead of the classical nucleophilic addition by a phosphanido ligand, is unveiled in rhodium‐catalyzed olefin hydrophosphanation. This hydride‐driven pathway operates for both activated and inactivated olefins, with transition states characterized by elongated Rh─H bonds and nascent C─H bond formation ...
Víctor Varela‐Izquierdo +4 more
wiley +1 more source
Flipping the Card With Enantiodivergent Organocatalysis
Chemistry – A European Journal, EarlyView.This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre +3 more
wiley +1 more source
Molecules, 2015 Chiral tertiary and quaternary amine solvating agents for NMR spectroscopy were synthesized from the wood resin derivative (+)-dehydroabietylamine (2). The resolution of enantiomers of model compounds [Mosher’s acid (3) and its n-Bu4N salt (4)] (guests ...
Tiina Laaksonen +2 more
doaj +1 more source
Asymmetric transformation of achiral gold nanoclusters with negative nonlinear dependence between chiroptical activity and enantiomeric excess. [PDF]
Nat Commun, 2023 Liu C +6 more
europepmc +1 more source
Chiral (Stereoselective) Drugs, Asymmetric Synthesis, and Racemic Resolution Methods. [PDF]
ChiralityChirality is crucial in drug development since both biological targets in the organism and the majority of pharmaceutical compounds are chiral. The synthesis and resolution of chiral compounds are critical steps while developing chiral drugs. Asymmetric synthesis and racemic resolution are the two most common methods for obtaining enantiopure drugs ...
Karayavuz B, Kirmizioglu CK.
europepmc +2 more sources
Chemistry – A European Journal, EarlyView.An Artificial metalloenzyme was designed by a Michael addition between a MnSalen complex and a cysteine residue within NikA crystals. The heterogeneous catalyst was found capable of an enantioselective and stereospecific epoxidation of cis‐β‐methylstyrene in cristallo.
Manel Boukhallat +8 more
wiley +1 more source