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Showing 1 to 20 of 34 for “"metallation"”.
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Chiral phosphine synthesis by the application of directed metallation
The ortho metallation of some aromatic ring systems has been investigated in regard to the influence of several types of phosphorus-centred directing groups upon the reactivity, regioselectivity, and utility in later synthetic elaboration. The metallation step allows derivatisation in several …
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Competitive metallation of porphyrins by vanadyl and nickel ions
Includes bibliographical references (pages 55-56).
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Advances in synthetic, structural and reaction chemistry of zinc and zincate complexes containing alkyl and/or amido ligands
One of the most important reactions in chemistry, metallation benefits society in general as it is utilised for the synthesis of many commodities used in daily life. While lithium-based monometallic compounds have long been the reagents of choice for metallation, bimetallic reagents are emerging as …
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Synthesis, Characterization And Application Of Pt Complexes With Pincer Ccc-Bis(Nhc) Ligands
The unique metallation/transmetallation route for the synthesis of CCC-bis(NHC) pincer ligand supported transition metal complexes was extended to Pt. Several platinum complexes were synthesized. The identity of these complexes was confirmed through multiple technologies, including nuclear magnetic …
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Synthesis, characterization and properties of rigid macromolecules with extended conjugation, using palladium-catalyzed alkynylated polyhaloarenes.
… macromolecules will be derived from the metallation of the aforementioned alkynylated arenes.
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New Chemistry of Mercaptoazulenes and Low-Valent Complexes of Isocyanoarenes
… of this dimercaptan and regioselective metallation was demonstrated for the generation of its mono-nuclear coordination complex. Additionally metallation of the second thiolate termini is also discussed. Chapter 2 describes the synthesis of isomeric mercaptazulenes featuring cyano …
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Bio-inspired iron complexes featuring secondary coordination sphere interactions: Ligand design strategies and dioxygen reactivity
… Early work focused on the synthesis and metallation of a dipodal ligand framework capable of tautomerization from a pyrrole-imine to an azafulvene-amine upon metallation. Dative coordination of this ligand with iron(II) salts demonstrated the success of this approach, resulting in ligand …
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[4 + 1] annulation reactions of (trialkylsilyl)ketenes : synthesis of substituted indanones and cyclopentenones
… organolithium compounds (prepared via metallation of readily available N- substituted benzotriazole derivatives) with (TAS)vinylketenes generates dienolate intermediates which cyclize to form cyclopentenones. Most cases of the annulation proceed with a high level of …
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Synthesis of Molecular Baskets and Introduction of Inward Facing Functionality
… developed. The first utilized directed ortho metallation to place electrophiles above and/or directed into the cavity. Perlithiation of the host could lead to sixty-nine products but reaction conditions and host rigidity limited product formation. This reaction technique led to the placement …
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Oxyanion reduction in a non-heme iron system
… secondary sphere. Previous reports detailed the metallation routes to access both tautomeric forms of the ligand in iron(II) complexes. Moreover, the ability of each arm of the ligand to tautomerize independently was observed in an iron(II)-hydroxo complex that included both tautomeric forms. The …
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The arylation of 2-pyrones and related heterocycles
… of these substrates occurs via concerted metallation-deprotonation.
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Functionalised polymers
… the excess lithium diisopropylamide present, metallation by potassium t-butoxide followed by reaction with 2-(3-chloropropyl)-2-methyl-1,3-dioxalane resulted in the formation of 2-methyl-2(4-(vinylphenyl)-butyl-1,3,-dioxalane. The butyllithium initiated anionic polymerisation of this protected …
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Exploiting cooperative effects in s-Block organometallics for new applications in synthesis and catalysis
… transformations, namely deprotonative metallation and C-F bond activation.Group 1 alkyl compounds MCH2SiMe3 (M = Li, Na or K) have proved to be efficient catalysts for intermolecular hydroamination of a wide range of substituted vinylarenes and alkynes at room temperature and with short …
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Porphyrin-DNA as scaffold for nanoarchitecture and nanotechnology
… interaction between porphyrins stacked on DNA. Metallation with zinc or copper of different porphyrins (namely diphenyl porphyrins and tetraphenyl porphyrins) was also successfully achieved, after they had been attached onto DNA. Based on EPR measurements, evidence was found for intermolecular …
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Bulky cyclopentadienyl chromium complexes as ethene trimerisation catalyst precursors
… ,3-diene. (ii) The attempted use of a metallation I alkylation route which was unsuccessful. (iii) The use of tetracyclone as starting material, reacted with alkyl likthium reagents, or alkyl Grignard reagents which resulted in the formation of ligands, of the type C₅Ph₄R, with R in the …
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Palladium catalyzed carbon-carbon bond formation at carbon-hydrogen bonds
… have brought to the forefront the concerted metallation-deprotonation mechanistic model for direct arylation. Ultimately, these studies led to the first non-directed intermolecular direct arylation of a simple arene. In a second section, efforts toward the inclusion of pi-deficient …
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Studies in organobismuth chemistry
… when using microwave energy. Reactions such as metallation of aromatic rings, ligand redistribution and synthesis were carried out in PTFE containers in a conventional domestic microwave oven. An X-ray diffraction study of (phenylazophenyl-C,N')mercury(II) chloride has shown it to be dimeric via …
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Mechanism of biosynthesis of the dimanganese-tyrosyl radical cofactor of class lb Ribonucleotide reductase
… and oxidants in vitro, and therefore how metallation of NrdF with manganese is controlled in vivo.
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Synthesis and characterization of bifunctional materials for electro-optical applications
… a transition metal atom have been prepared. In a metallation step a Ru(II) dye was created which carries holetransport moieties as antenna groups. The new, bifunctional materials have been characterized and their potential for application in electro-optical devices have been investigated. II. …
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