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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 44 for “"air-stable"”.
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Synthesis and Application of Air-Stable Secondary Phosphine Oxide, Oxime, and Amine-Phosphine Palladium(II) Complexes in Transfer Hydrogenation and Cross-Coupling Reactions
… active catalysts. A comparison study between the air-stable precatalysts and in situ generated catalysts showed improved activity for the precatalysts. Typically, the aforementioned privileged classes of ligands behave as spectators during the bond activation process. However, ligands containing …
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Nickel precatalysts as enabling tools for catalytic coupling reactions
[Chemical formula] A series of air-stable nickel complexes of the form L₂Ni(aryl)X (L = monodentate phosphine, X = Cl, Br) and LNi(aryl)X (L = bis-phosphine) have been synthesized and are presented as a library of precatalysts suitable for a wide variety of nickel-catalyzed transformations. These …
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Facile route to air and moisture stable β-difluoroboryl acrylamides
A method for the preparation of air stable difluoroboryl acrylamides is reported. In contrast to the ubiquitous organotrifluoroborate salts, difluoroboryl acrylamides are relatively nonpolar and are readily purified by silica gel chromatography. Difluoroboryl acrylamides serve as efficient …
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Biphasic, Homogeneous, and Heterogeneous Hydrocarbon Conversion Reactions with Novel Aluminum Chloride Based Catalyst Systems
… reactions. For this purpose, cheap and air stable Lewis acidic chloroaluminate ionic liquids were the starting point for our investigations. Chloroaluminate melts are immiscible with hydrocarbon phases, and thus, biphasic oligomerization reactions allow a simple product separation by …
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Synthesis, characterization and evaluation of flourocarbon containing rhodium complexes for biphasic hydroformylation reactions
… , respectively. The complexes were isolated as air stable solids.
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New applications of heteroarylzinc nucleophiles
… compounds. Chapter 1. The Synthesis of a Solid, Air-Stable 2-Pyridylzine Reagent and its Use in Negishi Cross-Coupling Reactions. As an alternative to unstable or unreliable 2-pyridylboron reagents, a solid, air-stable 2- pyridylzinc reagent was developed. Using 1,4-dioxane as an additive enabled …
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Development of new transition metal catalysts for C-N bond formation and continuous flow processes for C-F bond formation
… is explored. Chapter 1. Development of an Air-Stable Nickel Precatalyst for the Amination of Aryl Chlorides, Sulfamates, Mesylates, and Triflates. A new air-stable nickel precatalyst for C-N cross-coupling is reported. The developed catalyst system displays a greatly improved substrate …
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Controlled doping of organic semiconductors and 2d materials with molecular reductants and oxidants
New air-stable dimeric n-dopants are synthesized and studied in detail with respect to the kinetics of both their redox reaction in solution with and their doping in the solid-state of various organic semiconductor acceptors. Detailed mechanistic studies are necessary to recognize the strengths and …
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Heterocumulene insertions with group 6 Diaryl Nitrosyl complexes
… insertion. The resulting complexes are thermally stable and air-stable, and can be described as being 18-electron species. Protonolysis of the representative heterocumulene-inserted complex Cp*W(NO){112-N(p-tol)C(0)Ph}Ph releases the functionalized heterocumulene molecule, p-tolylbenzamide.All new …
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The Influence of Defects on the Vibrational and Electronic Properties of the Quasi 1D van der Waals Magnet CrSBr
… magnetic, optical, and electronic properties, air stability, and quasi-1D electronic structure. In this thesis, we implement resonant Raman spectroscopy to explore the electron-phonon interactions in CrSBr. We find that the electron-phonon coupling is strongly polarized along the …
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Synthesis and Characterization of Some Rhenium Complexes
… as an organic conductor, because it is highly air-sensitive and oxidizes when exposed to molecular oxygen, therefore making this an unattractive use for commercial products. Attention has been focused on heterocylic aromatic polymers such as polythiophene and polypyrrole, in efforts to produce …
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A Stereospecific Pd-Catalyzed Suzuki Cross-Coupling Reaction and a Statistical Study of the Ligand's Role in Stereoselection
… group compatibility, while employing non-toxic, air-stable organoboron nucleophiles. Conventional studies of Pd-catalyzed Suzuki cross-coupling reactions have focused on C(sp<sup>2</sup>)-C(sp<sup>2</sup>) cross-coupling reactions, which result in the formation of planar products. Conceptually, …
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Organo-iridium compounds: synthesis, characterization and reactivity
… synthesized and found to be water-soluble and fairly air-stable. Other water-soluble compounds, [lr(COD)(tripod)]CI, [lr(COD)(dmpe)]CI and [lrH(COD)(PMe3)3]CI2 [tripod = 1 ,1, 1-tris(diphenylphosphinomethyl)ethane, dmpe = (dimethylphosphino)ethane] were also synthesized by similar methods. All …
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Electrical excitation of colloidally synthesized quantum dots in metal oxide structures
… rendering index. This work demonstrates that air-stable metal oxides can be used to achieve QD-LEDs that have long shelf lives and operate at constant luminance in ambient conditions, unpackaged. Because metal oxides range from conductors to dielectrics, they can be used to develop a variety …
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Eta5-pentamethylcyclopentadienyl ruthenium complexes containing sulfur ligands
… (iv) [(iPrO)2P(S)S]2 produced air-stable Cp*Ru(S2CNR2)Cl2 (R = Me, 2.1; R = Et, 2.2), Cp*Ru(S2COiPr)Cl2 (2.3) and air-sensitive Cp*Ru(S2P(OiPr)2)Cl2 (2.4), respectively. The reactions of 2.1, 2.2 and 2.3 with Na(S)SCNEt2 gave Cp*Ru(S2CNMe2)(S2CNEt2)]Cl (2.5), [Cp*Ru(S2CNEt2)2]Cl …
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Titanium dioxide (TiO2) as buffer layer in organic solar cell device
… work function metal to oxygen and moisture in air. An inverted structure of organic solar cell (OSC) device with active layers (donor and acceptor) sandwiched by indium tin oxide (ITO) as the cathode and much higher work function metal and more air stable such as aurum (Au) or silver (Ag) as …
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The asymmetric synthesis of enol phosphates and their application in total synthesis
… temperature using commerically available and air stable PEPPSI catalysts.
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BIFUNCTIONAL BF2 COMPLEXES OF POLYDENTATE BIS(AMIDINATES): SYNTHESIS, STRUCTURES, AND PHOTOLUMINESCENCE PROPERTIES
… fluorophores that have the potential to serve as air stable indicators and sensors for applications in medicine, materials science, and supramolecular chemistry.</p> <p>The syntheses of the precursor bis(amidines) <strong>L<sup>1-5</sup></strong>H<sub>2</sub> were carried out through a proven …
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MoS₂ electronics : technology, high yield circuits and applications
… nature, excellent transport properties and stable crystalline structure of MoS₂. Despite all the progress, the MoS₂ electronics demonstrated so far is limited to single or few-device- scale circuits built on exfoliated flakes due to the many challenges associated with the uniformity and …
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Rhodium-Catalyzed Enantioselective Desymmetrizations of Oxabicyclic Alkenes and Alkene Difunctionalization via Nickel-Catalyzed Arylcyanation
… This nickel-catalyzed reaction uses an air-stable catalyst precursor to achieve a highly practical synthesis of a nitrile-containing oxindole via a domino Heck-cyanide capture cascade. Derivatizations of the nitrile group affords a series of novel heterocyclic scaffolds. Chapter 2 …
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