Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Transition Metal Catalyst"”.
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Using Data-Driven Models to Understand Transition Metal Catalyst Energy Landscapes and Metal-Organic Framework Stability
… activity observed only in enzymes. Single-site catalysts represent the most promising synthetic analogues to these enzymes, often enabling atom-economy, tunability, and selectivity not possible with bulk heterogeneous catalysts. Single-site catalysts with 3d transition-metals can access a range …
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Development of Main Group Systems for Small Molecules Activation
… (FLP) have been introduced as an alternative to transition metal catalyst. Since the first discovery in 2006, FLP has found diverse applications in areas such as small molecules activation and catalysis. The present thesis has two major directions: 1) find new types of FLP; 2) demonstrate their …
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Reactions for rapid access to C3a oxygenated pyrroloindolines and its application towards a novel route to pestalazine A
… These conditions exclude the use of expensive transition metal catalyst, LED lamps and long reaction times. This new method wasa then utilized in a synthetic study on the natural product pestalazine A.</p> <p> 1,1′-diaryl ethanes are an important functionality in many biologically active …
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Trichloroacetimidates As Outstanding Electrophiles for the Carbon-nitrogen, Carbon-oxygen and Carbon-carbon Bonds Formation and Synthetic Studies of Protein Phosphatase-5 (pp5) Small Molecule Inhibitors
… using trichloroacetimidates with a Lewis acid catalyst and the regioselectivity of the alkylation can be varied by changing the solvent. A plethora of secondary trichloroacetimidates participate providing excellent yields of N-alkyl product, while switching the solvent showed a preference for …
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Chemical vapor deposition (CVD) growth and optimal transfer processes for graphene
… to produce large area graphene crystals on transition metal catalyst substrates. In particular, Cu with low carbon solid solubility is suitable to obtain uniform single layer deposition of graphene over large areas. Here, we report reliable method to grow high-quality continuous graphene …
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Zincative Functionalization of C–H Bonds Using Lithium Amide Zincate Bases
… harsh reaction conditions with toxic and rare transition metal catalysts. Deprotonative zincation has been demonstrated as a useful method to achieve C–H functionalization. </p><p>The direct C–H amination of a wide scope of arenes and heteroarenes has been achieved by copper-catalyzed …
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Block Copolymer Formation by Transformation Reactions
… catalysed by the premixed and unmixed bimetallic catalyst system WCl₆/LiBu has been studied dilatometrically. These studies show that both the premixed and unmixed catalyst systems show similar catalytic properties. The rate of polymerisation shows a maximum at a catalyst/monomer ageing …
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Nickel-catalyzed coupling reactions and synthetic studies toward ent-dioxepandehydrothyrsiferol via an epoxide-opening cascade
… of preparing allylic alcohols. Most asymmetric transition metal-catalyzed methods of preparing enantiomerically enriched allylic alcohols rely on chiral ligands. The nickel-catalyzed allene--aldehyde coupling exploits the axial chirality in 1,3-disubstituted allenes in achieving asymmetric …
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Applying Trichloroacetimidates to the Synthesis of Benzylic Trichloroacetamides & Functionalized Indoles
… is differentiated because it does not use any transition-metal catalyst or strong base. Additionally, this methodology is envisioned to be applied in the synthesis of spirocycles from bis-trichloroacetimidates, which are three-dimensional in structure and prominent in medicinal chemistry.</p>
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Asymmetric Transfer Hydrogenation of Secondary Allylic Alcohols
… process, which utilizes the unique ability of a transition metal catalyst to effect a combined reduction of the C-C double bond and the carbonyl group in a selected class of secondary allylic alcohols.</p> <p>With <em>a</em>-vinyl benzyl alcohol as substrate, the optimal catalyst for this …
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Thermodynamics and kinetics of hydrogen storage in magnesium hydride: a theoretical study of catalyst-dopant, defect, and size effects
With their high capacity, light-metal hydrides – like MgH2 – remain under scrutiny as reversible H-storage materials. A key question persists: Is there a means to enhance the hydrogen desorption/adsorption properties of this “simple” hydride by decreasing size (e.g., creating nano-sized particles …
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Sustainable catalysis using iron based catalysts for hydrofunctionalization of c=x (x = o, n) unsaturated bonds
Transition metal complexes are capable of catalyzing organic transformations with exceptional efficiency and are rightly considered as indispensable tools in organic synthesis. High catalytic activity (especially at low catalyst loadings), selectivity, and stability are some of the important …
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Dirhodium(II,II) paddlewheel complexes conjugated to a polypyridyl tris-amine scaffold: synthesis and application as asdjncaslpre-catalysts in the hydroformylation of 1-octene
… of CO/H2 (synthesis gas) to olefins using a transition-metal catalyst to produce linear and/or branched aldehydes. This reaction is in alignment with the Green Chemistry philosophy, applying principles such as using renewable feedstocks, atom economy, and catalysis. The use of rhodium-based …
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Controlling the end groups and rates of catalytic polymerization
… Chain transfer polymerization involves a catalyst that is capable of polymerizing a monomer, reacting with a chain transfer agent to cleave the polymer chain from the catalyst, and reinitiate the growth of a new polymer chain. However, the current catalysts and chain transfer agents used …