Results 61 to 70 of about 12,602 (203)

Pyrazine-bridged polymetallic copper–iridium clusters

Acta Crystallographica Section E: Crystallographic Communications
Single crystals of the molecular compound, {Cu20Ir6Cl8(C21H24N2)6(C4H4N2)3]·3.18CH3OH or [({Cu10Ir3}Cl4(IMes)3(pyrazine))2(pyrazine)]·3.18CH3OH [where IMes is 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene], with a unique heterometallic cluster have ...
Ben. J. Tickner, Richard Gammons, Adrian C. Whitwood, Simon B. Duckett   +3 more
doaj   +1 more source

Dual Ligand‐Enabled Nondirected C─H Olefination of (Hetero)Arenes for the Synthesis of Clickable Derivatives

Chemistry – A European Journal, EarlyView.
We report an efficient method for late‐stage installation of “clickable” alkyne groups into diverse (hetero)arenes. Using a dual‐ligand palladium catalyst that combines an NASA ligand with an N‐heterocycle, an acrylate unit bearing a terminal alkyne can be introduced via nondirected C─H activation.
Tommaso Braga, Maria Hergert, Manuel van Gemmeren   +2 more
wiley   +1 more source

Crystal structure of poly[[aqua(μ2-pyrazine-κ2N:N′)(μ2-2,3,5,6-tetrachlorobenzene-1,4-dicarboxylato-κ2O1:O4)copper(II)] hemihydrate]

Acta Crystallographica Section E: Crystallographic Communications
The asymmetric unit of the title compound, {[Cu2(C8Cl4O4)2(C4H4N2)2(H2O)2]·H2O}n or {[Cu2(Cl4bdc)2(pyz)2(H2O)2]·H2O}n comprises of a CuII ion, one tetrachlorobenzenedicarboxylate ion (Cl4bdc2−), one pyrazine ligand (pyz), and one and a half water ...
Hitoshi Kumagai, Satoshi Kawata, Nobuhiro Ogihara   +2 more
doaj   +1 more source

On the Role of Linker Fluorination in the Adsorption‐Induced Structural Response of CeIV‐Based Metal‐Organic Frameworks

Chemistry – A European Journal, EarlyView.
The effect of the degree of fluorination of the organic linker on the adsorption behavior of MIL‐140A(Ce) is systematically investigated with a combination of experimental techniques. Cooperative adsorption is switched off in less fluorinated frameworks, as a result of reduced steric hindrance around the adsorption sites.
Francesca Nerli, Virginia Guiotto, Francesca Nardelli, Andrea Giovanelli, Linda Bizzarro, Federico Zizzi, Matteo Signorile, Marco Geppi, Lucia Calucci, Valentina Crocellà, Marco Lessi, Marco Taddei   +11 more
wiley   +1 more source

Discovery and Biological Evaluation of a Series of Pyrrolo[2,3-b]pyrazines as Novel FGFR Inhibitors

Molecules, 2017
Abnormality of fibroblast growth factor receptor (FGFR)-mediated signaling pathways were frequently found in various human malignancies, making FGFRs hot targets for cancer treatment. To address the consistent need for a new chemotype of FGFR inhibitors,
Yan Zhang, Hongchun Liu, Zhen Zhang, Ruifeng Wang, Tongchao Liu, Chaoyun Wang, Yuchi Ma, Jing Ai, Dongmei Zhao, Jingkang Shen, Bing Xiong   +10 more
doaj   +1 more source

Mid‐Infrared Spectroscopy and Machine Learning for Chlorogenic Acid Quantification in Coffee

Chemie Ingenieur Technik, EarlyView.
Chlorogenic acid (CGA) concentration in coffee was predicted using mid‐infrared (MIR) spectroscopy and a machine learning approach. Forty‐four roasting stages (140–220 °C) plus a green coffee control were analyzed. A multilayer perceptron regressor, trained on preprocessed MIR data, outperformed traditional peak analysis, enabling accurate and ...
Deborah Herdt, Felix Wühler, Thomas Kunz, Victoria Schiwek, Sarah Kühnemuth, Brian Gibson, Matthias Rädle   +6 more
wiley   +1 more source

Synthesis of nanodiamond derivatives carrying amino functions and quantification by a modified Kaiser test

Beilstein Journal of Organic Chemistry, 2014
Nanodiamonds functionalized with different organic moieties carrying terminal amino groups have been synthesized. These include conjugates generated by Diels–Alder reactions of ortho-quinodimethanes formed in situ from pyrazine and 5,6-dihydrocyclobuta[d]
Gerald Jarre, Steffen Heyer, Elisabeth Memmel, Thomas Meinhardt, Anke Krueger   +4 more
doaj   +1 more source

Heteroaryl‐Substituted Polyfluorobiaryls Synthesis via Palladium‐Catalyzed Double CH Bond Functionalization Using Palladium 1,4‐Migration Associated to Direct Arylation

European Journal of Organic Chemistry, EarlyView.
Fluoro substituents on a benzene ring linked to a 2‐bromoaryl group enables the selective activation of one of its CH bonds via Pd‐1,4‐migration. Then, Pd‐catalyzed direct coupling with heteroarenes produces C2’‐heteroarylated 1,1′‐biaryls. In this reaction, the new C–C bond arises from the functionalization of two CH bonds.
Norman Le Floch, Thierry Roisnel, Henri Doucet   +2 more
wiley   +1 more source

Recent Advances in Conjugated Microporous Polymers for Photocatalysis: Mechanism, Synthesis and Applications

Exploration, EarlyView.
Conjugated microporous polymers (CMPs) have attracted more and more attention as new photocatalysts due to their unique advantages such as high performance, long stability and strong light absorption. This review summarizes the application of CMPs as a photocatalyst in recent years and introduces the catalytic mechanism.
Dun Zhou, Kongqing Zhang, Xiaobai Li, Yongpeng Liu, Liang Yao, Hongwei Ma   +5 more
wiley   +1 more source

Novel Halogenated Pyrazine-Based Chalcones as Potential Antimicrobial Drugs

Molecules, 2016
Chalcones, i.e., compounds with the chemical pattern of 1,3-diphenylprop-2-en-1-ones, exert a wide range of bio-activities, e.g., antioxidant, anti-inflammatory, anticancer, anti-infective etc. Our research group has been focused on pyrazine analogues of
Marta Kucerova-Chlupacova, Veronika Vyskovska-Tyllova, Lenka Richterova-Finkova, Jiri Kunes, Vladimir Buchta, Marcela Vejsova, Pavla Paterova, Lucia Semelkova, Ondrej Jandourek, Veronika Opletalova   +9 more
doaj   +1 more source