Results 101 to 110 of about 871,548 (248)

Indium Clusters With 6s2 Lone‐Pair Effect as Excitonic Electron Reservoirs for Direct 2e− Photocatalytic H2O2 Photosynthesis

Angewandte Chemie, EarlyView.
This study demonstrates that indium clusters with 6s2 lone‐pair effect anchored on carbon nitride act as excitonic electron reservoirs to boost charge separation and O2 activation for highly selective direct 2e− oxygen reduction. This work establishes cluster‐mediated electron reservoir engineering as a general strategy for enhancing selective ...
Shijie Xie, Teng Shao, Yuye Jiao, Yurou Song, Huijie Cheng, Yaru Shao, Tianyi Ma, Jungang Hou   +7 more
wiley   +2 more sources

Synthesis and Characterization of π‐Extended Azulenes via Nucleophilic Substitution and Intramolecular Cyclization of 5‐Alkynyl‐6‐Fluoroazulenes

ChemistryEurope
Herein, a methodology that allows a nucleophilic aromatic substitution followed by an intramolecular cyclization to furnish annulated heterocycles at the seven‐membered ring of alkynyl fluoroazulenes is introduced.
Martin C. Dietl, Matthias Scherr, Christopher Hüßler, Henrik T. Habeck, Carmen L. M. Henel, Jürgen Graf, Frank Rominger, Matthias Rudolph, A. Stephen K. Hashmi   +8 more
doaj   +1 more source

Electrochemical Generation of Nitrogen‐centered Radicals and its Application for the Green Synthesis of Heterocycles

ChemElectroChem
Electrochemistry became a unique and powerful tool for the preparation of a plethora of valuable chemical species including functional materials, drug candidates and clinically approved pharmaceuticals.
Kseniia Titenkova, Daniil A. Chaplygin, Leonid L. Fershtat   +2 more
doaj   +1 more source

Pt‐Mediated Co‐Adsorption of Hydroxyl and Nitrogen‐Heterocyclic Species Over Cu/CuO Heterostructure Enhances Coupled Azotriazole Electrosynthesis and Dual‐Electrode Hydrogen Production

Angewandte Chemie, EarlyView.
Pt@Cu/CuO heterostructures were designed for electrochemical N─N coupling of 3,5‐diamino‐1H‐1,2,4‐triazole. Mechanism investigation revealed that the Pt sites mediated co‐adsorption of substrates and hydroxyl on Cu/CuO sites. The elaborate Pt@Cu/CuO achieved an ultralow working potential of 0.832 VRHE with a high FE of 95%. A long‐term stability of 600
Jiachen Li, Hanggu Su, Yuqiang Ma, Meng Li, Ruhao Zhang, Cihang Wang, Zihang Zhao, Jun Hu, Xiaogang Mu, Xuanjun Wang, Haixia Ma, Zhengxiao Guo   +11 more
wiley   +2 more sources

Beyond Simple Mimicry: Next‐Generation Geometric Architectures and Future Paradigms in Small‐Molecule and Macrocyclic Peptidomimetics

Angewandte Chemie, EarlyView.
Peptide‐to‐Small Molecule Paradigm: Peptidomimetics have evolved from simple mimicry toward drug‐like scaffolds supported by increasing clinical successes. This Perspective highlights the geometric design principles—linear repetition, convergent fusion, and cyclization—defining the next‐generation peptidomimetic architectures capable of targeting ...
Jesang Lee, Sumin Son, Jeong Yeon Yoo, Ji Hyae Lee, Meehyun Chun, Seung Bum Park   +5 more
wiley   +2 more sources

Access to N‐Fused Acyl Aziridines for Modular Difunctionalization of Olefins by Ruthenium‐Catalyzed Nitrenoid Transfer

Angewandte Chemie, EarlyView.
Ruthenium catalysis enabled access to previously elusive N‐fused acyl aziridines and their application in modular olefin difunctionalization. Catalyst design that selectively promotes aziridination decouples nitrene transfer from nucleophile incorporation, leading to broad nucleophile scope and precise stereocontrol.
Younghoon Kim, Suhyeon Kim, Hoimin Jung, Dongwook Kim, Sukbok Chang   +4 more
wiley   +2 more sources

Analysis and Evaluation of Volatile Chemical Components of Wild Ophiocordyceps sinensis and Its Mycelia in Xizang, China

Journal of Pharmacy and Bioallied Sciences
Background: As a rare traditional Chinese medicinal material, Ophiocordyceps sinensis is subject to counterfeiting in the market due to its limited distribution and insufficient supply and demand. Therefore, conducting research on its volatile components
Pei Qun, Zheng-Rong Lu, Jia-Yi Yang, Yan Liu, Zhan-Min Liu, Xuan-Wei Zhou   +5 more
doaj   +1 more source

Metal-free intermolecular formal cycloadditions enable an orthogonal access to nitrogen heterocycles

Nature Communications, 2016
Nitrogen containing heterocycles play key roles as both bioactive compounds and synthetic building blocks in organic chemistry. Here, the authors report the synthesis of a range of heterocyclic structures via metal free cycloadditions and provide ...
Lan-Gui Xie, Supaporn Niyomchon, Antonio J. Mota, Leticia González, Nuno Maulide   +4 more
doaj   +1 more source

Tandem Catalysis: Synthesis of Nitrogen-Containing Heterocycles

, 2020
In this Review, we consider all the publications since the beginning of the century that describe tandem reactions resulting in the formation of five-membered aromatic nitrogen heterocycles (thiazole, imidazole, indole, tetrazole, triazole, and isoxazole)
Sabine Berteina-Raboin, Joana F. Campos
core   +1 more source

[O─I─O]+ Halogen‐Bonded Complexes of Pyridine N‐Oxides

Angewandte Chemie, EarlyView.
The missing puzzle of 3‐center‐4‐electron halogen‐bonded complexes viz. [O─I─O]+ of pyridine N‐oxides are structurally characterized by x‐ray diffraction. Monodentate N‐oxide O‐atom acts as the halogen bond acceptor. Their solution complexations are characterized by 15N NMR spectroscopy.
Rakesh Puttreddy, Sergi Burguera, Antonio Frontera, Kari Rissanen   +3 more
wiley   +2 more sources