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Showing 1 to 20 of 43 for “"gold(I)"”.
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Gold(I) complexes and co oxidation catalysts
Isonitrile gold(I) nitrates, (RNC)AuNO₃ (R = Buᵗ, Et or Xy) have been prepared and fully characterised. These join the rare set of gold(I) species exhibiting ligation to oxygen and are the first examples of gold(I) bonded to both carbon and oxygen. Molecular aggregations of the monomeric units were …
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Novel Organic Transformations Arising from Gold(I) Chemistry
The use of gold in organic chemistry is a relatively recent occurrence. In addition to being previously considered too expensive, it was also believed to be chemically inert. Soon after the early reports indicating its rich reactivity, the number of reports on chemical transformations involving …
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An Investigation of Gold(I) Catalyzed Cycloaddition Reactions
Unit I, Two successful 13- and 15-membered macrocycles containing furan and α-chloroketone functional groups were synthesized. Macrocycles were subjected to solvent mixture (Et<sub>3</sub>N, CF<sub>3</sub>CH<sub>2</sub>OH, and Et<sub>2</sub>O), and an oxyallyl cation was presumably formed, which …
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Synthese von Gold(I)-Dithioharnstoff-Methansulfonat und dessen Anwendungsmöglichkeiten
… eines elektrolytischen Verfahrens war es möglich Gold(I)-Dithioharnstoff- Methansulfonat darzustellen. Dabei konnte auf den Einsatz von Cyaniden, Sulfiden, Sulfiten und Thiosulfaten verzichtet werden. Eine zeitintensive Synthese, über Gold(III) mit anschließendem Reduktionsschritt zum Gold(I), …
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Intermediates and Mechanisms of Gold(I)-Catalyzed Nucleophilic Addition Reactions
Generally, gold(I) complexes interact with pi-bonds of alkenes, alkynes and allenes to initiate nucleophilic addition reactions. As the key intermediates in these reactions, there has been recent interest in the synthesis and study of cationic, two-coordinate gold pi-hydrocarbon complexes. However, …
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ULTRAFAST DYNAMICS IN NITRO- AND (ORGANOPHOSPHINE)GOLD(I)-POLYCYCLIC AROMATIC HYDROCARBONS
… substituted with nitro groups and those with gold(I) phosphine groups. In both families of PAH investigated the triplet state is populated in high yield following excitation by UV light. The population of the triplet states occurs ultrafast, with lifetimes in the hundreds of femtoseconds in …
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Gold(II) fluorosulfate derivatives and new gold(I) and platinum(II) carbonyl complexes
… in HSO3F via reduction of Au(SO3F)3(solv) by gold metal. Both types of materials obtained were studied by electron resonance spectroscopy, where spectra indicative of high axial symmetry are obtained. The similar gis0 values indicate that the same species is present in a similar, near square …
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Mechanistic Studies of pi-Activation Catalysis by Cationic Gold(I) and Brønsted-acid
<p>Soluble gold(I) complexes are highly efficient catalysts for the functionalization of C-C multiple bonds through the addition of carbon- or heteroatom-nucleophiles across π-bonds or cycloisomerizations of enynes and related π-systems. Mechanisms involving outer-sphere attack of a nucleophile on …
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Anodic Behavior of Gold: I. Surface Oxidation. Ii. Monolayer Adsorption of Palmitic Acid
Made available in DSpace on 2014-12-05T19:37:40Z (GMT). No. of bitstreams: 1 6101600.pdf: 3514553 bytes, checksum: 679ce013fcd4a77df27153813cf7be7b (MD5) Previous issue date: 1961
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Synthesis, structure and spectroscopic investigations of luminescent heterobimetallic gold(I)-Rhodium(I) species
A novel, three-coordinate gold(I) dimer, Au2(tfepm)3Cl2 (la, lb), was synthesized and structurally characterized. Four gold(I)-rhodium(I) heterobimetallic complexes, AuIRh'(tBuNC)2(-dppm)2C12 (2), Au'Rh'(tBuNC)2(u-dmpm)2Cl2 (3), Au'Rh'(tBuNC)2(,u-tfepm)2C12 (4), and AuIRh(tBuNC)2(u-tfepma)2Cl2 (5) …
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1,2,3-triazoles as X-factor in gold(I) activation of challenging C-C triple bond transformations
… was revealed.;A series of 1,2,3-triazole gold complexes were synthesized/characterized. This dissertation presents the results of research effort to explore the unique chemoselectivity and improved thermal stability that arises when triazole is introduced as a X-factor or secondary ligand. …
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Gold(I) and Platinum(II)-Catalyzed Hydrofunctionalization of Allenes and Alkenes with Carbon and Nitrogen Nucleophiles
… for their syntheses.</p></p><p><p>A cationic gold(I) <italic>N</italic>-heterocyclic carbene complex catalyzed the intermolecular hydroarylation of allenes with indoles to form (<italic>E</italic>)-allylic indoles in modest to good yield at room temperature. The protocol was effective for …
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Synthesis, characterization, and anticancer evaluation of novel gold(I) phosphine thiolate complexes : solubility, cellular uptake, and cytotoxicity.
… characterization, and evaluation of novel gold(I) phosphine thiolate complexes as potential anticancer agents. Inspired by the activity of auranofin and the limitations of existing platinum-based drugs such as cisplatin, this research sought to explore the therapeutic potential of …
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Constants of acid ionization and chelate formation of penicillamine and cysteine with gold (I) and other important metals at simulated biological conditions
… with the metals calcium(II), iron(III) and gold(I) by potentiometric titration using a standard glass and calomel reference electrode to determine hydrogen ion activity in solution. The results were treated with the computer program SCOGS which is capable of resolving multiple metal ligand …
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Catalytic C-N and C-F bond formation by organometallic group 11 complexes
… presents a study of the reaction between an (NHC)gold(I) fluoride complex (NHC = N-heterocyclic carbene) and alkynes (Chapter 1). Gold(I) and fluoride add trans across the triple bond of 3-hexyne and 1-phenyl-l-propyne to form (fluorovinyl)gold(I) complexes, with exclusive geminal arrangement …
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Synthesis of Well-Defined N-Heterocyclic Carbene (NHC) Complexes of Late Transition Metals
… synthesis of well-defined organosilver and organogold complexes bearing NHC ligands. In addition, two short chapters describe briefly the synthesis of NHC acetylacetonate palladium(II) complexes, and the use of NHC ruthenium(II) indenylidene complexes in ring opening metathesis polymerization …
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Estudio de diferentes estrategias para la síntesis de compuestos de oro(I) con propiedades luminiscentes de alta eficiencia
Gold(I) complexes bearing P- and N-ligands constitute a very interesting class of molecular materials as they can give rise to novel structural and photophysical properties due to their great coordinative versatility. The properties of these compounds can be modulated depending on the type of …
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The chemistry of gold with unsaturated organics: coordination, activation and catalysis
The aim was to understand gold‟s reactivity with unsaturated organic bonds. We focused on the role of supporting ligands, activating agents and the organic substrates employed in such reactions. Gold tetrafluorophthalimidates have been isolated, with coordination found to be surprisingly strong; no …
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Activación carbolífica de enlaces múltiples carbono-carbono: Reacciones de migración de ésteres propargílicos promovidas por IPyxBF4 y de cicloadición intermolecular catalizadas por complejos de oro (I)
… presents the results obtained in the IPy2BF4 or gold(I) activation of different unsaturated systems that results in the development of new intermolecular promoted or catalytic processes. Based on the nature of the carbophilic species and the transformation presented, this Manuscript is divided in …
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