Results 101 to 110 of about 169,803 (413)

Dehydration of Aromatic Heterocyclic Carboxamides to Aromatic Heterocyclic Carbonitriles [PDF]

Molecules, 1997
Phosphorus pentoxide is commonly used for the dehydration of heterocyclic carboxamides to the corresponding nitriles. In this report, the use of cyanuric chloride/N,N-disubstituted formamide for this reaction is described. The advantages of this procedure are mild reaction conditions and good yields.
Werner Bonrath, Horst Pauling, Reinhard Karge, Fabrice Aquino   +3 more
openaire   +2 more sources

Harnessing Synergistic Cooperation of Neighboring Active Motifs in Heterogeneous Catalysts for Enhanced Catalytic Performance

Advanced Materials, EarlyView.
This review examines the critical role of neighboring active motifs in heterogeneous catalysts, emphasizing how their synergistic cooperativity can be rationally designed to modulate catalytic properties. The discussion centers on the modulation of electronic and geometric structures, categorizing the catalytic systems into metal‐acid (Brønsted/Lewis ...
Peng Yuan, Ching Kit Tommy Wun, Tsz Woon Benedict Lo   +2 more
wiley   +1 more source

Hydrazones as Singular Reagents in Asymmetric Organocatalysis [PDF]

, 2016
This Minireview summarizes strategies and developments regarding the use of hydrazones as reagents in asymmetric organocatalysis, their distinct roles in nucleophile–electrophile, cycloaddition, and cyclization reactions.
Fernández Fernández, Rosario Fátima, Lassaletta, José M., Matador Martínez, Esteban, Monge Fernández, David, Retamosa Hernández, María Gracia   +4 more
core   +1 more source

Enhanced Oxygen Evolution Kinetics via Single‐Atom Catalyst Design: A Review

Advanced Materials Interfaces, EarlyView.
Single atom catalysts (SACs) in oxygen evolution reaction (OER). TOC shows key aspects like synthetic strategies, supports‐selection principle, metal types, and OER performances in SACs. Abstract This review highlights recent advancements in enhancing oxygen evolution reaction kinetics through the design of single‐atom catalysts.
Zhen Yuan, Yingjie Yu, Qiao Xie, Lixiang Ding, Wen Lei, Haijun Zhang, Yonggang Yao, Yuhua Wang   +7 more
wiley   +1 more source

Regioselective zincation of indazoles using TMP2Zn and Negishi cross-coupling with aryl and heteroaryl iodides. [PDF]

, 2012
The metalation of various SEM-protected functionalized indazoles with TMP2Zn provides 3-zincated indazoles which undergo palladium-catalyzed Negishi cross-couplings in good ...
Andreas Unsinn, Batt, Bunnell, Bunnell, Chevallier, Clutterbuck, Collot, Crestey, Despotopoulou, Dong, Dunst, Farina, Fraile, Haag, Haag, Kienle, Knochel, Luo, Malamas, Mulvey, Negishi, Negishi, Negishi, Negishi, Negishi, Ohnmacht, Pabba, Paul Knochel, Perez, Peruncheralathan, Piazza, Pyne, Schmidt, Stadlbauer, Sun, Villieras, Welch, Whisler, Wunderlich, Wunderlich, Yang   +40 more
core   +1 more source

Variations in the 6.2 $μ$m emission profile in starburst-dominated galaxies: a signature of polycyclic aromatic nitrogen heterocycles (PANHs)? [PDF]

, 2017
Analyses of the polycyclic aromatic hydrocarbon (PAH) feature profiles, especially the 6.2 $\mu$m feature, could indicate the presence of nitrogen incorporated in their aromatic rings. In this work, 155 predominantly starburst-dominated galaxies (including HII regions and Seyferts, for example), extracted from the Spitzer/IRS ATLAS project (Hern\'an ...
arxiv   +1 more source

Surface Coordination and Polymerization of Allyl Mercaptan Passivates the Oxidation of Copper

Advanced Materials Interfaces, EarlyView.
This study demonstrates that allyl mercaptan self‐assembles on the surface of copper via coordination and polymerization, forming an ultrathin polymeric passivation layer (8.06 ± 0.50 nm). The modified copper foil achieves a two‐order‐of‐magnitude anti‐corrosion performance enhancement across multi‐service environments. Abstract The oxidation of copper
Jiahao Yang, Xiaomeng She, Song Zhang, Ruixuan Qin, Dongming Cheng, Jian Peng   +5 more
wiley   +1 more source

Copper catalyzed late-stage C(sp3)-H functionalization of nitrogen heterocycles

Nature Communications, 2021
Late-stage C(sp3)-H bond functionalization of N-heterocycles with broad substrate scope remains a challenge and of particular significance to modern chemical synthesis and pharmaceutical chemistry. Here the authors show copper-catalysed late-stage C(sp3)-
Zhe Chang, Jialin Huang, Si Wang, Geshuyi Chen, Heng Zhao, Rui Wang, Depeng Zhao   +6 more
doaj   +1 more source

Development of covalent triazine frameworks as heterogeneous catalytic supports [PDF]

, 2019
Covalent triazine frameworks (CTFs) are established as an emerging class of porous organic polymers with remarkable features such as large surface area and permanent porosity, high thermal and chemical stability, and convenient functionalization that ...
Krishnaraj, Chidharth, Leus, Karen, Tahir, Norini, Van Der Voort, Pascal   +3 more
core   +1 more source

Bright and Stable Electrochemiluminescence by Heterobimetallic IrIII‐MI (MI = CuI, AuI) Complexes

Advanced Optical Materials, EarlyView.
Bright and stable electrochemiluminescence (ECL) of a new class of heterobimetallic ionic transition metal complexes is triggered in the presence of the coreactant n‐tri propylamine (TPrA) upon highly energetic electron transfer (eT). A quantum efficiency (ΦECL) up to six‐fold higher than that of benchmark tris‐(2,2′‐bipyridyl) ruthenium(II) is ...
Mattia Reato, Beatrice Polido, Anna Bonfiglio, Giulia Moro, Vincent César, Stéphane Bellemin‐Laponnaz, Alessandro Alla, Neso Sojic, Matteo Mauro, Federico Polo   +9 more
wiley   +1 more source