440 hasil
Menampilkan 1–20 · 0,66 detik · RSS
ChemistryEurope
ISSN 2751-4765 · Wiley-VCH · 440 artikel di indeks
-
Artikel Jurnal
Helicene‐Bis‐Porphyrin Conjugates: Exciton Coupling Chirality and Chiral‐Induced Spin Selectivity
Following previous work on helicene–porphyrin conjugates in which carbo[6]helicene are connected to zinc‐porphyrin via phenyl‐bis‐ethynyl bridges (Por(Zn)‐H[6]1, series 1), and displaying clear exciton coupling (EC) chirality, novel carbo[6]helicenes derivatives substituted at their 2,15 positions…
-
Artikel Jurnal
Cyclization of Citronellal to Isopulegol Catalyzed by Temperature‐Stable Aluminum Complexes with Tripodal Tris(silanolate) Ligands
(−)‐Isopulegol is a key intermediate in the industrial routes to (−)‐menthol. New aluminum catalysts are now presented for the diastereoselective transformation of citronellal to isopulegol, which carry tridentate tris(silanolate) ligands connected by a central arene ring. Such ligands are readily…
-
Artikel Jurnal
Tracking Propagating Perturbations in Chemical Reactions
Periodic perturbations, such as modulations of reactant concentration, propagate through chemical reactions with distinct phase delays. Tracking the propagation of such perturbations presents a powerful approach for probing the reaction connectivity and the rates of individual reaction steps…
-
Artikel Jurnal
Mn2+ Bispidine Complexes as Potential Magnetic Resonance Imaging Agents : Noncoordinating Peripheral Functional Groups Affect Structural, Kinetic, and Relaxation Properties
Mn2+ bispidine complexes combine unprecedented kinetic inertness with high relaxivity and are under scrutiny as potential magnetic resonance imaging (MRI) probes. This study demonstrates that, beyond the rigid, preorganized bispidine structure and the first coordination sphere of the Mn2+ ion…
-
Artikel Jurnal
Activation of the CN Single Bond in Iso(thio)cyanates by a Phosphinine‐Borane Lewis Pair: Unravelling a Complex Reaction Network
The first example of a CN σ‐bond activation in tert‐butyl isocyanate and isothiocyanate by a 3,5‐bis(trimethylsilyl)‐phosphinine‐B(C6F5)3 Lewis pair is reported. Despite the inherently low nucleophilicity of phosphinines, the first step of the observed reactions is the unusually facile…
-
Artikel Jurnal
Light‐Enabled [2σ + 2π] Cycloadditions of Bicyclo[1.1.0]butanes and Alkenes by Ti‐Salen Photocatalysis
Bicyclo[2.1.1]hexanes (BCHs) have emerged as promising three‐dimensional bioisosteres of benzenoids, garnering considerable interest from both synthetic and medicinal chemistry communities. In this study, we disclose a photoinduced intermolecular [2σ + 2π] cycloaddition reaction between…
-
Artikel Jurnal
Flow‐Pulse Adsorption Microcalorimetry as a General Method to Characterize Diffusion Processes on Solid Catalysts
Fundamental studies of diffusion processes on solid catalysts are challenging due to the lack of appropriate characterization techniques. Herein, using NH3 diffusion on various zeolites as an example, flow‐pulse adsorption microcalorimetry (FPAM) is demonstrated capable of characterizing diffusion…
-
Artikel Jurnal
White Phosphorus Activation with Cobalt–Zinc Complexes: Access to Phosphorus‐Rich Sandwich Compounds
The utilization of two electronically distinct elements for the cooperative activation of white phosphorus (P4) is a promising route to novel and reactive polyphosphido complexes. Herein, the preparation of cyclooctadiene Co–Zn complexes and their application in the activation of white phosphorus…
-
Artikel Jurnal
Mannich Reaction With Pyridoxal 5′‐Phosphate Dependent Decarboxylative Aldolase for Synthesis of Noncanonical α‐Amino Acids
Functionalized benzosultam and sulfonamide derivatives represent privileged pharmacophores in medicinal chemistry. However, noncanonical amino acids (ncAAs) featuring benzosultam side chains remain underexplored for peptide therapeutics, despite significant advances in peptide drug development…
-
Artikel Jurnal
Imidazoline‐Proline and Imidazoline‐Prolinate Ligands for Copper‐Catalyzed Asymmetric Exo‐Selective [3 + 2] Cycloaddition of Iminoesters with Nitroalkenes
Diphenylethylenediamine‐derived imidazoline‐amino acid derivatives are designed as nonphosphine chiral nitrogen ligands for metal‐catalyzed exo‐selective [3 + 2] cycloaddition reaction of iminoesters with nitroalkenes. The newly developed (R,R)‐imidazoline‐L‐proline and t‐butyl prolinate‐Cu(OTf)2…
-
Artikel Jurnal
Bioinspired Light‐Driven Organic Rotary Molecular Systems
To harness the potential of rotary molecular systems (RMSs), it is basic to operate beyond thermodynamic equilibrium, requiring a continuous energy input. Light, due to its abundance, noninvasive nature, and precise spatial and temporal control, serves as an ideal energy source. This review…
-
Artikel Jurnal
Copper‐Catalyzed Defluorinative Allylboration of Allenes with Trifluoromethyl Alkenes
An N‐heterocyclic carbene/Cu‐catalyzed coupling of allenes, bis(pinacolato)diboron, and trifluoromethyl alkenes is reported. The method allows access to stereodefined borylated 1,1‐difluoro‐1,5‐dienes with high levels of selectivity. The integration of a 1,5‐diene scaffold with boron and fluorine…
-
Artikel Jurnal
Silatranylnitrilium Hexachloridoantimonate, its Brønsted Base‐Assisted CC‐Bond Formation and Transformation to an Unprecedented Carbene‐Type SbCl5 Complex
Silylium ions, three‐coordinated as well as donor‐stabilized, have attracted the interest of chemists for many years, have paved its way into practical application as catalysts for organic reactions, and have contributed to the understanding of fundamental chemistry problems. Since the first…
-
Artikel Jurnal
A Masked Low‐Coordinate and Polarized Au(I)/Pt(0) Complex for Cooperative CX and CH Bond Activation of Pyridines
Bulky terphenyl phosphine ligands allow the isolation of a masked low‐coordinate, highly polarized Au(I)/Pt(0) complex. At variance to the inertness of prior coordinatively saturated AuPt systems, this complex exhibits cooperative reactivity toward pyridines. CX activation is observed for…
-
Artikel Jurnal
Simultaneously Boosting Graphitization and Nitrogen Doping of Carbon Catalysts for Enhanced Alkaline Oxygen Reduction Reaction Catalytic Activity
Oxygen reduction reaction (ORR) is pivotal in energy conversion devices. Metal‐free nitrogen‐doped carbon (NC) catalysts are promising for alkaline ORR. Yet, the tradeoff between graphitization and nitrogen doping limits their catalytic activity. Herein, a strategy to enhance graphitization and…
-
Artikel Jurnal
Hard Carbon in Alkali Metal Ion Batteries
Hard carbons (HCs) are nongraphitizable and consist of numerous short‐range carbon layers stacked together. The carbon layers are twisted around each other and form large layer spacing as well as diverse pore types, making it ideal for extensive application in alkali metal ion batteries (AMIBs)…
-
Artikel Jurnal
Stereoselective and Enantiospecific Synthesis of Trisubstituted 1,3a,4,6a‐Tetrahydropentalene via Cuneane Scaffold Editing
Cage‐type hydrocarbons represented by cubane serve as molecular scaffolds for various useful molecules, such as pharmaceuticals and organocatalysts. However, even for the most readily available cubane, achieving regioselective substitution and controlled induction of chirality remains extremely…
-
Artikel Jurnal
Styrene Polymerization with Group III Metallocenes: A Generative and Interpretable Catalyst Design Strategy Combining Density Functional Theory and Machine Learning
The rational design of group III metallocene catalysts for styrene polymerization remains a complex challenge due to intertwined steric and electronic effects that govern monomer coordination and insertion. A generative and interpretable machine learning (ML) framework is presented, grounded in…
-
Artikel Jurnal
Selective N‐Alkylation of Unprotected Amino Sugars by Alcohols. Application to the Synthesis of Sugar‐Based Surfactants
A method for direct N‐functionalization of unprotected amino sugars using alcohols as alkylating agents is presented. The method relies on an iridium‐catalyzed hydrogen borrowing strategy, offering a direct and highly effective approach for modifying unprotected carbohydrates. This approach avoids…
-
Artikel Jurnal
Future Perspective On Materials, Electrochemistry, and Cell Concepts for Redox‐Mediated CO2 Direct Air Capture Scenarios
Anthropogenic emissions of previously sequestered carbon continue to disrupt the natural carbon cycle, driving atmospheric carbon dioxide (CO2) concentrations beyond 420 ppm. This has resulted in global temperatures rising beyond 1.5 °C above the pre‐industrial level. Direct air capture (DAC) of…