Results 61 to 70 of about 871,584 (246)

Tunable Endo/Exo Selectivity in Direct Catalytic Asymmetric 1,3‐Dipolar Cycloadditions with Polyfunctional Lewis Acid / Azolium‐Aryloxide Catalysts

Angewandte Chemie International Edition, Accepted Article.
Catalytic asymmetric 1,3‐dipolar cycloadditions (1,3‐DCA) using iminoesters as ylide precursors offer a powerful approach to accessing stereochemically complex, biologically relevant pyrrolidines. While previous studies have already achieved impressive stereoselectivities, catalytic productivity remains a challenge, with turnover numbers (TON ...
Adrian Bürstner, Patrick Becker, Alexander Allgaier, Lucca Pfitzer, Daniel Wanner, Johanna Dollinger, Felix Willig, Justin Herrmann, Vukoslava Miskov-Pajic, Andreas Hans, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +13 more
wiley   +1 more source

Iridium‐Catalyzed Enantioselective Intramolecular Hydroarylation of Allenes: Formal Synthesis of (+)‐Rhazinilam

Angewandte Chemie International Edition, EarlyView.
A highly enantioselective iridium‐catalyzed hydroarylation of allene‐tethered pyrroles and indoles that provides access to relevant heterocyclic systems bearing vinyl‐substituted 3ry or 4ry stereocenters is reported. Its synthetic potential was exemplified with a very short, highly enantioselective formal synthesis of (+)‐Rhazinilam, whereas DFT ...
Andrés Arribas, Alejandro Rey, Martín Calvelo, José L. Mascareñas, Fernando López   +4 more
wiley   +1 more source

Evidence for Methylaluminoxane (MAO) Molecular Structure and Reactivity from Ultra‐High Magnetic Field 27Al MAS NMR Spectroscopy Combined with DFT Calculations.

Angewandte Chemie International Edition, Accepted Article.
The structure and reactivity of methylaluminoxane (MAO), a reagent of major interest for olefin polymerization, both industrially and academically, has been probed using ultra‐high magnetic field solid‐state NMR spectroscopy (28.2 T, 1200 MHz for 1H Larmor frequency). High resolution methods combined with density functional calculations allowed for the
Kai C. Szeto, Mostafa TAOUFIK, Franck Fayon, David Gajan, Eva Zurek, Jochen Autschbach, Julien Trebosc, Laurent Delevoye, Régis Michaël Gauvin   +8 more
wiley   +1 more source

Quantum Anomalies in Condensed Matter

Advanced Physics Research, EarlyView.
Quantum materials provide a fertile ground in which to test and realize quantum anomalies predicted by quantum field theory. Quantum anomalies need to be canceled globally, however, quantum states with a quantum anomaly can exist at the boundary of topological materials.
Michael T. Pettes, Shi‐Zeng Lin, Elizabeth A. Peterson, Jian‐Xin Zhu, Laurel E. Winter, Johanna C. Palmstrom, Jinkyoung Yoo, Nicholas S. Sirica, Prashant Padmanabhan, Priscila F. S. Rosa, Sean M. Thomas, Avadh Saxena   +11 more
wiley   +1 more source

Activin A‐activated ALK4 induces pathogenic Th17 involved endothelial–mesenchymal transition in systemic lupus erythematosus‐associated pulmonary arterial hypertension

Arthritis &Rheumatology, Accepted Article.
Objective Autoimmune diseases, such as systemic lupus erythematosus (SLE), are associated with pulmonary arterial hypertension (PAH), a condition that can lead to heart failure. However, whether T cells also contribute to the occurrence of PAH in SLE, has not been clarified.
Shuliang Jing, Junyan Qian, Hongjie Ying, Pei Mao, Mingxin Yao, Zhihong Wu, Harm J Bogaard, Lie Wang, Mengtao Li, Jun Yang   +9 more
wiley   +1 more source

Can We Draw Conclusions on Supernova Shock Wave Propagation Using Short‐Lived Radioactive Isotopes?

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT We run a three‐dimensional Galactic chemical evolution (GCE) model to follow the propagation of 53Mn (exclusively produced from type Ia supernovae, SNIa), 60Fe (exclusively produced from core‐collapse supernovae, CCSNe), 182Hf (exclusively produced from intermediate mass stars, IMSs), and 244Pu (exclusively produced from neutron star mergers ...
Benjamin Wehmeyer, Andrés Yagüe López, Benoit Côté, Maria K. Petö, Chiaki Kobayashi, Maria Lugaro   +5 more
wiley   +1 more source

Physics-based parametrization of the surface impedance for radio frequency sheaths

, 2017
The properties of sheaths near conducting surfaces are studied for the case where both magnetized plasma and intense radio frequency (rf) waves coexist.
J. Myra
semanticscholar   +1 more source

Spectroscopic Interrogation of Thiolate Hydrogen Bonding in the CO Sensor Protein CooA: Implications for Thiolate Ligation Stability and Cytochrome P450 Function

Chemistry – A European Journal, Accepted Article.
Cysteine (Cys) thiolate coordination is a unique ligation motif found in heme enzymes and small molecule sensors. Divergence between these two functional classes of heme thiolate proteins is a result of distinct hydrogen bonding interactions with the axial Cys(thiolate) ligand.
Brian R. Weaver, Richard J. Jodts, Brian M. Hoffman, Joshua A. Telser, Judith N. Burstyn   +4 more
wiley   +1 more source

Investigation of the Degree of Functionalization and Colloidal Stability of Shell‐by‐Shell Functionalized TiO2 Nanoparticles as a Function of Different Phosphonic Acid Chain Lengths

Chemistry – A European Journal, Accepted Article.
In this work, a series of Shell‐by‐Shell (SbS)‐functionalized colloidal systems consisting of 6 nm TiO2 anatase nanoparticles (NPs), one of the phosphonic acids (PAs) propylphosphonic acid (PAC3), hexylphosphonic acid (PAC6), dodecylphosphonic acid (PAC12), tetradecylphosphonic acid (PAC14), hexadecylphosphonic acid (PAC16), octadecylphosphonic acid ...
Lisa M. S. Stiegler, Vincent Wedler, İdil Büküşoğlu, Andreas Hirsch, Wolfgang Peukert, Johannes Walter   +5 more
wiley   +1 more source

Hybrid Inorganic‐Organic Rotaxanes and Related Compounds

Chemistry – A European Journal, EarlyView.
A review of HRMs over the last 10 years is presented, including aspects of their supramolecular chemistry, magnetic properties, and applications. Abstract The extension of previous studies of heterometallic rings (HMRs) is described, including new synthetic chemistry and physics.
Selena J. Lockyer, George F. S. Whitehead, Grigore A. Timco, Eric J. L. McInnes, Richard E. P. Winpenny   +4 more
wiley   +1 more source