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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 20 of 45 for “"Hydrosilylation"”.
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Tailored activation of new platinum hydrosilylation catalysts
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Highly Active Iron-NHC Complexes for Carbonyl Hydrosilylation
The catalytic hydrosilylation of carbonyl groups into alcohols is a powerful transformation in the laboratory and industry. Despite the recent advances in this field, the development of catalytic systems that can activate inexpensive silanes like polymethylhydrosiloxane (PMHS) under mild conditions …
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Hydrosilylation and hydroboration catalyzed by imido-hydride complexes of molybdenum (IV)
… (Tp )(ArN)Mo(H)(PMe3) (2). Both 1 and 2 catalyze hydrosilylation of a variety of carbonyls. Detailed kinetic and DFT studies found that 1 reacts by an unexpected associative mechanism, which does not involve Si-H addition either to the imido group or the metal. Despite 1 being a d2 complex, its …
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Metal-ligand cooperativity in first row transition metals: hydrosilylation catalysis and mechanistic insights
… of the ligands during catalytic reactions. Hydrosilylation of alkenes is one of the most important reactions in the silicone industry, which is currently dominated by catalysts based on PGMs. 1st row transition metal catalysts for this process typically exhibit low turnover numbers and …
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The development and synthetic application of titanium-mediated carbon-heteroatom double bond hydrosilylation methodologies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1997.
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The synthesis and characterization of platinum(II) oxalate complexes and investigations into their potential as UV-triggerable hydrosilylation catalysts
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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Metal complexes with ω-alkenyl ligands. synthesis, structure, reactivity, and applications in chemical vapor deposition (CVD) and hydrosilylation catalysis
… the synthesis, characterization, and catalytic hydrosilylation activity of platinum(II) dialkenyl compounds of stoichiometry PtR2, where R = CH2SiMe2(vinyl) (1) or CH2SiMe2(allyl) (2), and their 1,5-cyclooctadiene adducts PtR2(COD), denoted 1-COD and 2-COD. We also report analogous studies of …
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Synthesis and characterization of platinum(II) loaded thermosensitive poly(vinyl ether)s and investigations into their potential as UV-triggerable hydrosilylation catalysts
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Catalytic hydrofunctionalization and small molecule reactivity at a low-valent cobalt center supported by a bis(carbene) CCC pincer ligand
… the (DIPPCCC)CoN2 species, specifically towards hydrosilylation and hydroboration, two processes typically mediated by precious metal catalysts. Hydrosilylation of terminal alkene substrates proceeded in good yields with secondary and tertiary silanes, an important feat for earth-abundant …
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Sustainable catalysis using iron based catalysts for hydrofunctionalization of c=x (x = o, n) unsaturated bonds
… novel iron and cobalt based pincer complexes in hydrosilylation of aldehydes and ketones. Within the field of organic chemistry, the carbonyl moiety is central to many broadly used synthetic modifications and fragment coupling steps, including Grignard reactions and Wittig olefinations. …
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Octopus and dendrimer molecules with silsesquioxane cores
… octopus molecules via H2PtC16 catalyzed hydrosilylation of 1-alkenes and vinyl-functional siloxanes by T<sub>8</sub> hydrogen silsesquioxane, (HSiO<sub>3/2</sub>)<sub>8</sub>, has been demonstrated. The chemistry of addition was studied, and it was found that while the addition of the …
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Novel materials based on functionalised silsesquioxanes
… Typically, coupling reactions involved hydrosilylation with H<sub>2</sub>PtCl<sub>6</sub> or [Pt{(η-ViMe<sub>2</sub>Si)<sub>2</sub>O}(P<sup>t</sup>Bu<sub>3</sub>)]. <br></br><br></br>Mesogenic compounds have been shown to undergo a change in the liquid crystalline phase produced, once …
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Immobilized Bis-Indenyl Ligands for Stable and Cost-Effective Metallocene Catalysts of Hydrogenation and Polymerization Reactions
… functionalized silica gel by two methods: hydrosilylation and thiol-ene coupling of the double bond. After comparing the results, the second strategy was chosen as more efficient. The materials can be used further as intermediates for synthesis of supported metallocene catalysts.</p>
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Radical Approaches to Alangium and Mitragyna Alkaloids
… hydrides to alkenes to afford the corresponding hydrosilylation products. The chemistry of the hydrosilylation products was then explored – it was hoped that a subsequent Peterson olefination or Fleming-Tamao oxidation would afford the corresponding alkene or alcohol. Subsequent investigations …
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Zitronensäureether als Liganden für die zuverlässige Funktionalisierung von magnetischen Nanopartikeln
… alkyl chains can be further functionalized by hydrosilylation. By this simple type of reaction it is possible to integrate magnetic nanoparticles via covalent bonds into (bio)organic systems. Complex compounds of an analog short-chain ligand were used to study the coordination chemistry of the …
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Probing the Impact of Solvent on Lewis Acid Catalysis via Fluorescent Lewis Adducts
… data and catalytic Diels-Alder cycloaddition and hydrosilylation reactions, illustrating that solvation effects can be appropriately gauged by a LAU value determined from the FLA method.
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Engineering mesoporous silicon for cell biology applications
… biocompatible we modify porous silicon using hydrosilylation and bioconjugation techniques to render it inert to degradation and allow for cell adhesion. We looked at the potential to use porous silicon as a co-culture by patterning it with patterned regions of different adhesive peptides …
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Copper-catalyzed enantioselective stereodivergent synthesis of amino alcohols
… using the sequential copper hydride-catalyzed hydrosilylation and hydroamination of readily available enals and enones. This strategy provides a route to all possible stereoisomers of these amino alcohol products, which contain up to three contiguous stereocenters. Catalyst control and …
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Optical Characterization of Ultrasmall, Hydrogen-Terminated and Carboxyl-Functionalized Silicon Nanoparticles in Aqueous Environments
… Si-np prepared via thermal hydrosilylation of surface Si-H bonds with an ω-ester 1-alkene. Figure 1.1 shows a sketch (based on our results) of an ultrasmall Si-np that is ~1 nm in diameter and contains approximately thirty silicon atoms. The chemical groups shown on the …
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High fracture toughness and high modules silicone resins
… silicone hydrides. The resin is cured by hydrosilylation between the two. Intrinsic toughening improves the plasticity and rigidity of the resin by choices of crosslinkers and polyphenylsilsesquioxane oligomers. The characteristics of molecular structure of the crosslinker and …
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