Results 131 to 140 of about 289,056 (278)

1,4‐Digermacyclopenta‐1,3‐diene: Continuous Cyclic σ*–π Delocalization Enables Aromatic Stabilization in a Heavy‐Element 4π System

Angewandte Chemie, EarlyView.
A five‐membered digermacycle exhibits an unusual 4π electron delocalization enabled by σ*(Ge–C)–π coupling within a nearly planar framework. Combined experimental and theoretical analyses reveal a continuous cyclic delocalization pathway, highlighting σ*–π interactions as a design principle for aromatic stabilization beyond classical π‐conjugated ...
Daichi Uchida, Hiroko Yamada, Yoshiyuki Mizuhata   +2 more
wiley   +2 more sources

Atroposelective Access to π‐Conjugated 1,2‐Azaborepines Enabled by Palladium‐Catalyzed Cyclization of N‐Heterobiaryls with Alkynylboronates

Advanced Science, EarlyView.
We report a palladium‐catalyzed atroposelective cyclization of N‐heterobiaryl triflates with alkynyl boronates to access seven‐membered 1,2‐BN‐bridged biaryls with high yields and excellent enantioselectivity via a cascade DyKAT, cis‐carbopalladation, and 1,2‐migration, which expands the toolbox for axially chiral π‐conjugated boron compounds and opens
Fengya He, Zhen Wang, Haoyu Guo, Shuguang Chen, Xu Zhang, Yongjia Shang, Hui Wang   +6 more
wiley   +1 more source

Cyclo‐Polyproline: Chameleonic All‐Peptide Macrocycles With Induced‐Fit Host‐Guest Recognition

Angewandte Chemie, EarlyView.
Macrocycles served as the genesis of supramolecular chemistry, advancing synthetic, separation, and materials fields. Despite their utility, they typically lack synthetic control. This work establishes a robust platform for all‐peptide macrocycles capable of host‐guest complexation and chameleonic behavior.
Camilla Di Girolamo, Patricia C. Fleming, Caroline R. Kwawu, Amanda R. Guimarães, Jimmy Muldoon, Julia Bruno‐Colmenarez, Yannick Ortin, Michael R. Probert, Felipe Fantuzzi, Aniello Palma   +9 more
wiley   +2 more sources

Solvent organization in the ultrahigh-resolution crystal structure of crambin at room temperature

IUCrJ
Ultrahigh-resolution structures provide unprecedented details about protein dynamics, hydrogen bonding and solvent networks. The reported 0.70 Å, room-temperature crystal structure of crambin is the highest-resolution ambient-temperature structure of a ...
Julian C.-H. Chen, Miroslaw Gilski, Changsoo Chang, Dominika Borek, Gerd Rosenbaum, Alex Lavens, Zbyszek Otwinowski, Maciej Kubicki, Zbigniew Dauter, Mariusz Jaskolski, Andrzej Joachimiak   +10 more
doaj   +1 more source

Structural Characterization of Quaterphenyl Cation Radical:  X-ray Crystallographic Evidence of Quinoidal Charge Delocalization in Poly-\u3cem\u3ep\u3c/em\u3e-phenylene Cation Radicals [PDF]

, 2007
Quaterphenyl derivative (QP) containing tert-butyl solubilizing groups at the terminal positions yields a stable cation radical salt that was isolated, and its structure was established by X-ray crystallography.
Banerjee, Moloy, Lindeman, Sergey V., Rathore, Rajendra   +2 more
core   +1 more source

Homoleptic and Heteroleptic Borylones L1‐B(Ph)‐L2

Angewandte Chemie, EarlyView.
Density functional theory and CCSD(T) calculations reveal that homoleptic and heteroleptic borylones L1–B(Ph)–L2 are thermodynamically accessible. Remarkably, the homoleptic borylones B(Ph)(N2)2 and B(Ph)(SPh2)2 exhibit higher bond dissociation energies than the related carbones.
Qin Ma, Wei Li, Ya Hu, Lili Zhao, Gernot Frenking   +4 more
wiley   +2 more sources

Isolation of a Chiral Anthracene Cation Radical: X-Ray Crystallography and Computational Interrogation of its Racemization [PDF]

, 2017
Chiral cation-radical salts hold significant promise as charge-transfer materials, chiroptical switches, and electron-transfer catalysts for enantioselective synthesis.
Bhatnagar, Anshul, Ivanov, Mikhail V., Rathore, Rajendra, Thakur, Khushabu   +3 more
core   +1 more source

Thermally Controlled Chiral Supramolecular Polymorphism in Water

Angewandte Chemie International Edition, EarlyView.
Using an amphiphilic oligo(phenyleneethynylene) derivative, we establish LCST‐coupled chirality as a strategy to regulate thermoresponsive supramolecular polymorphism in water. At room temperature, AggI forms discrete assemblies that transform into elongated helical fibers (AggII) near the LCST and subsequently to sheet‐like structures (AggIII) at ...
Zulema Fernández, Yongsheng Li, Daniel Martínez, Julia Terlau, Myongsoo Lee, Bartolomé Soberats, Gustavo Fernández   +6 more
wiley   +1 more source

A Synergistic Inhibitor Development Strategy Against Human UDP‐Galactose‐4‐Epimerase

Angewandte Chemie International Edition, EarlyView.
The epimerase GalE is crucial for the biosynthesis of cancer‐relevant O‐GalNAc glycans. Here, we employ orthogonal, structurally enabled small molecule fragment screens to yield both covalent and non‐covalent inhibitors against GalE within no more than 22 elaborated compounds.
William M. Browne, Jonathan Pettinger, Teresa Weckwerth, Andrew Purkiss, Sing Hei Lok, Louisa Penicaut, Roksana Ogrodowicz, Raveena Prema, Simone Kunzelmann, Chloe Roustan, Ganka Bineva‐Todd, Saskia Pieters, Francesca Zappacosta, Alfred E. Doherty, Isobel Oram, Christelle Soudy, Robert Quinlan, Joanna Redmond, Svend Kjaer, David House, Stephane Mouilleron, Jacob T. Bush, Benjamin Schumann   +22 more
wiley   +1 more source

Ribozymes for RNA‐Catalyzed RNA Methylation and Labeling

Angewandte Chemie International Edition, EarlyView.
Ribozymes are powerful tools for site‐specific RNA modification. Their activities range from installing tags and fluorophores to generating natural RNA methylations, making them valuable tools to uncover the many functions that RNA plays in nature.
Carolin P. M. Scheitl, Claudia Höbartner   +1 more
wiley   +1 more source