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Showing 1 to 11 of 11 for “"gold catalysis"”.
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A theoretical investigation in heterogeneous gold catalysis
Despite the nobleness of bulk gold metal in air, small supported gold particles have been shown experimentally to be active in a wide range of chemical reactions. The objective of this work was to study, theoretically, some of the fundamental aspects of the reactivity of gold catalysts. Using …
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Anion effects in Homogeneous Palladium and Gold Catalysis
… weak interactions to improve transition metal catalysis by studying the ways transition metal cations interact with both traditional and novel weakly-coordinating anions. Understanding of these interactions will better allow synthetic chemists to choose appropriate counterions for catalytic …
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Gold-catalyzed synthesis and functionalization of heteroarenes
… describes the results obtained from the study of gold-catalyzed synthesis or functionalization reactions or heteroarenes. The work is presented in four different chapters. The first chapter summarizes the most representative reactivity trends in the field of gold catalysis and serves as general …
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Supramolecular Nanostructures as Support Materials for Gold Nanoparticle Catalysts
The high catalytic activity of gold nanoparticles (AuNPs) has led to their use in a variety of industrially-relevant reactions, such as low-temperature CO-oxidation and selective alcohol oxidation. Most current research focuses on heterogenous gold catalysis, with metal oxides being the most …
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Efforts towards the Total Synthesis of Azaspiracid-3
… was constructed under the influence of acid catalysis. The EFGHI domain highlighted a chelate controlled Mukaiyama aldol reaction to produce C22-C40 linear precursor, and a DIHMA process to assemble the bridged ketal. With the recognition of bridged ketal and spiroaminal functionality in the …
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Gold-catalysed reactions of Nitrogen containing molecules
The development of several new gold-catalysed reactions are described. Two new strategies have been employed to access pyrroles by the cycloisomerisation of alkynyl aziridines, and the formation of α,β-unsaturated imides by the oxidation of ynamides has been developed. A rare gold-mediated …
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Synthesis and characterisation of carbon supported gold catalysts prepared by ion-exchange
Gold has been previously overlooked as a catalyst, mainly because the metal has been regarded as catalytically inert, and was tested as large aggregates, and not as nanocrystallites. Large crystallites of gold do not exhibit significant catalytic activity, and if they do, their activity is small …
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The Synthesis and Application of a Chiral Sulfonated Phosphine Ligand to Asymmetric Transition-Metal Catalysis
… application in asymmetric transition-metal catalysis. sSPhos is a dialkylbiaryl phosphine ligand bearing a sulfonate group. This sulfonate group can engage in non-covalent interactions, allowing sSPhos to influence site- and enantioselectivity when employed as a ligand for transition-metal …
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Gold catalysts prepared by ion exchange for use in ethylene glycol oxidation: An exploratory study
Heterogeneous catalysis using supported gold nanocrystallites has attracted increasing attention over the last two decades for its applicability to a wide range of reactions, offering activity under ambient conditions, as well as high selectivities towards particular products. This study focuses on …
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Towards a Formal Total Synthesis of Triptolide Via a Gold-catalyzed Cyclization Cascade
… of total syntheses spanning from 1980 to 2010. Gold-catalyzed transformations are an emerging field in synthetic organic chemistry, but their efficacy and potential uses are gaining much recognition among the synthetic organic community. Our research group is extremely interested in the …
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Reacciones de cicloisomerización y alcoxiciclación de o-(Alquinil)estirenos y de 1,3-Dien-5-inos catalizadas por complejos de oro(I)
La catálisis homogénea con complejos de oro ha sufrido un desarrollo espectacular en los últimos años convirtiéndose en una herramienta muy útil para la síntesis de una gran variedad de estructuras complejas, que no son accesibles mediante metodologías convencionales. Esta tesis se ha centrado en …