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Showing 1 to 12 of 12 for “"Direct arylation"”.
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Direct arylation of 2-pyrones, coumarins, 2-pyridinones and 2-quinolones
Direct arylation via C-H activation displays a number of advantages over traditional (Suzuki-Miyaura, Stille, etc.) coupling reactions. The 2-pyrone, coumarin, 2-pyridinone and 2-quinolone moieties are prevalent in numerous compounds which exhibit biological activity. In addition, due to the varied …
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Palladium catalyzed carbon-carbon bond formation at carbon-hydrogen bonds
… and subsequent removal of activating agents. Direct arylation reactions are attractive alternatives to traditional cross-coupling methods, as one of the pre-activated partners is replaced with a simple arene. The organometallic coupling partner is typically replaced as it is the most difficult …
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The arylation of 2-pyrones and related heterocycles
… applied to 2-pyrones and related heterocycles. Direct arylation via C–H activation of 2-pyrone, 2-pyridone and 2-coumarin compounds is described in Chapter 2. Protocols for the palladium-catalysed direct arylation of these molecules were developed and applied to a library of substrates. C–H …
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COMPLEXES OF GROUP 10 METALS WITH NON-CLASSICAL AND THIOETHER-FUNCTIONALIZED N-HETEROCYCLIC CARBENE LIGANDS
… NHCs and their catalytic activities in direct arylation reactions are presented. The third part is focused on indazolin-3-ylidene ligands, their coordination chemistry with palladium(II), and catalytic applications for the direct arylation of 1-methylpyrrole, Sonogashira cross-couplings, …
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Synthesis and Characterization of Siloles, Silole-Containing Polymers and Photoswitchable Polymer Brush
… polymers were also prepared by the direct arylation reaction. The Direct Arylation reaction via C-H bond activation is emerging as a potential alternative to traditional transition metal-catalyzed cross-coupling reactions. We investigated synthetic methods to synthesize silole …
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Transition Metal-Catalyzed Preparation and Functionalization of Nitrogen-Containing Heterocycles
… acids and esters, and organometallic fragments. Direct arylation is a recent advance in cross-coupling between aryl groups whereby one cross-coupling partner (usually the one bearing an organometallic fragment) is replaced by the simple arene (C-H bond). In the first section, we describe our …
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Exploiting imidate ligand effects in transition metal-mediated C-C bond forming processes
… and ring-opening metathesis polymerisation and direct arylation reactions, respectively, has been determined. [Au(N-imidate)(NHC)] and [AuBr2(N-imidate)(NHC)] complexes were prepared and the structure and bonding of the complexes examined spectroscopically and crystallographically. The …
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I. Multicatalysis: Development of a BiOTf₃-catalyzed Nucleophilic Addition/Hydrofunctionalization Reaction in the Synthesis of Complex Heterocycles; . . .
… most efficient and general catalysts for the C-H arylation of arenes and heteroarenes with haloarene donors. Despite the importance of this class of catalytic reactions, the mechanistic understanding is limited by the lack of direct experimental evidence, especially in the context of Lewis basic …
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Palladium and manganese catalysis in C-H activation
Direct arylation via C-H activation has emerged as a powerful tool for the construction of new aryl-aryl bonds and provides an alternative to classical cross coupling procedures. Double C-H activation in particular, represents a more sustainable approach in terms of waste, cost and atom economy. …
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Manipulating Conjugation in electronic polymers and graphitic materials: chemosensors, precursor routes, and self-assembly
… conjugated alternating copolymers by direct arylation polycondensation. Post-polymerization hydride reduction furnishes cross-conjugated copolymeric hydrogels that undergo phosphorylation and subsequent ionization upon exposure to chemical warfare agent (CWA) mimics. The resulting …
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Tailoring functional Π-conjugated polymers and molecules for organic photovoltaic applications
… and conformation dictate charge carrier direction and mobility, and polymer electronics, where dispersities and backbone defects can hinder device performance. Many of these materials are amphiphilic nature, leading to high degrees of intermolecular organization as a result of the …
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LUMINESCENT COMPOUNDS FOR APPLICATIONS IN PHOTONICS
… difluorinated NˆCˆN ligands through direct arylation via C-H activation reactions, never attempted on this kind of substrate. The synthesized ligands were then coordinated with Pt(II) cations to obtain the corresponding Pt(II) complexes. Photophysical characterization showed intense …