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 19 of 19 for “"Triple bond"”.
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Surging Seepage: A Triple Bond Accretion System
My current work revels in a state of flux. I strive for the work to be electrically charged, conveying a feverish sense of immediacy and vitality that implies motion and frenetic energy. The work is an accretion of brightly colored biomorphic forms that extend out from the wall and onto the floor. …
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1,2,3-triazoles as X-factor in gold(I) activation of challenging C-C triple bond transformations
… selectively perform the pi-acidity toward C-C triple bond over allene. With this triazole modification, the thermal stability of the corresponding gold(I) complexes is significantly improved. Triazole-gold(I) facilitated alkyne hydroboration was accomplished at 80 °C, which is a temperature …
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Studying the properties of conjugated donor acceptor complexes with naphthaleneimide acceptors and dialkoxybenzene donors linked by a triple bond
… and 1,3-dialkoxybenzene units linked by a triple bond have been designed. These complexes are similar in structure to the naphthalenediimide acceptors and dialkoxynaphthalene donors that have been extensively studied by the Iverson research group, but these new complexes are designed to …
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Studies of Complexes of Potential Catalytic Uses
… mode. Also the change in the carbon nitrogen triple bond stretching frequency for the coordinated benzonitrile ligand with the increasing σ donor ability of the amine and with change of counter anion is discussed. The unusual oxidative degradation of the hexakis--methylamineruthenium(II) …
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Synthesis and reactivity of early transitional metal complexes supported by sterically demanding amido ligands
… Thereto -- Chapter 4: The Molybdenum-Phosphorus Triple Bond: Terminal Phosphido Complexes and Phosphorus Atom Transfer -- Chapter 5: Oxygenation of PMo(N[R]Ar) 3: Synthesis and Reactivity of a Linear Terminal Phosphoryl (PO) Ligand -- Chapter 6: Molybdenum Complexes of an Amido Ligand Containing …
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Dioxycarbenes and 3,3-Dioxyvinylcarbenes in the Synthesis of Novel Heterocycles
… use of dioxyoxadiazolines possessing a tethered triple bond for the thermal generation of dioxycarbenes III which are capable of intramolecular cyclization. It was found that the cyclization of a dioxycarbene onto a tethered triple bond results in the regioselective generation, of another …
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Ruthenium catalysts for the synthesis of quinolines and enol esters
… are used for the activation of the alkyne triple bond, making it more susceptible to a nucleophilic attack of carboxylic acids. The obtained products are enol esters. The stereochemistry of these compounds is hard to control and strongly depends on the used catalyst and the nature of the …
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Study of the reaction of nitriles with dialkyl phosphites for synthesis of a-Amino-bis-phosphonates
… catalyst, facilitating the addition of the P-H bond across the nitrile triple bond. Product purification by short path distillation provided 90% pure product for the reaction with benzonitrile in 27% yield (structure was confirmed by 1H and 13C NMR), although purification by column …
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Catalytic C-N and C-F bond formation by organometallic group 11 complexes
… 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 between the phenyl group and gold in the latter case. This addition is reversible, and the (fluorovinyl)gold(I) complexes can …
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Synthetic peptides derived from decorin as building blocks for biomaterials based on supramolecular interactions
… (2•10-7 M) was functionalized with an N-terminal triple bond in order to obtain a peptide dimer via copper(I)-catalyzed cycloaddition reaction with 4,4'-diazidostilbene-2,2'-disulfonic acid. Rheological measurements showed that the presence of the peptide dimer was able to enhance the elastic …
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Structural Influences on the Photochemistry and Photophysical Properties of p-Phenylene Ethynylenes: Aggregation Effects and Solvent Interactions
… by water and addition of oxygen across the triple bond are the two dominant initial mechanisms of all major pathways in aqueous solution. Finally, the aggregation of OPEs with is studied in two systems: surfactants and model bacterial membranes. The placement of the ionic alkyl substituents …
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Enzymatic acylation of starch
… synthesis of starch 10-undecynoate. The triple bond in the -position of the fatty acid may act as a grafting site for further modification, with azide containing molecules, through "click" reactions (dipolar cycloaddition). Investigation of other reaction systems for enzymatic starch …
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Protective effects of s-propargylcysteine (SPRC) on in vitro neuronal damage induced by Amyloid-Beta (25-35)
… than SAC, but less competent than NaHS. The triple bond in SPRC is more nucleophilic than SAC that can react with the lone pair of electrons in free radicals. Oligomeric or fibrillar A?25-35 were added to the C6 glioma cell line and the cell viabilities were compromised. The decline in cell …
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Theory of quantum interference in molecular junctions
… transport properties of C60 using carbon-carbon triple bond anchoring groups and prove the validity of MRR when applied to such non-aromatic molecule.
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From the activation of tetraphosphorus to the chemistry of diphosphorus and beyond
The niobium-phosphorus triple bond in [P=-Nb(N[Np]Ar)3]- (Np = CH2tBu; Ar = 3,5-Me2C6H3) has produced the first case of P4 activation by a metal-ligand multiple bond. Treatment of P4 with the sodium salt of the niobium phosphide complex in weakly-coordinating solvents led to the formation of the …
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Amidate complexes of the group 4 metals : sythesis, reactivity, and hydroamination catalysis
… Insertion of isocyanides into the Zr-C bonds of [DMP(NO) tBu]₂Zr(CH₂Ph₂ results in the formation of ƞ₂-iminoacyl complexes, which can either undergo thermally induced C=C coupling to generate an enediamido complex (aryl isocyanides), or rearrange to generate a bis(amidate) …
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Synthesis, characterization, and catalytic reactivity of first-row transition metal CCC pincer complexes
… hydrides with CO2 showed insertion into the Fe−H bond to form a κ2-OOCH complex (L = PMe3, L’ = N2). This complex was also independently synthesized starting from (DIPPCCC)Fe(II)Cl(PMe3)2. The zwitterionic metalation method was also extended to other first-row transition metals. The synthesis and …
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Interfacial Energy Transfer in Small Hydrocarbon Collisions with Organic Surfaces and the Decomposition of Chemical Warfare Agent Simulants within Metal-Organic Frameworks
… employed to test how an interfacial hydrogen bonding network may affect the ability of a gas-phase compound to thermally accommodate (typically, the first step in a reaction) with the surfaces. Results indeed show that small organic compounds transfer less energy to the interconnected …
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The synthesis and characterisation of halogen and nitro phenyl azide derivatives as highly energetic materials
… Nβ and Nγ weaken the terminal nitrogen-nitrogen triple bond. The thermal decomposition of three nitrophenyl azides, 1,3,5-(NO2)3-2,4,6-(N3)3-C6 (TNTA), 1,3-(NO2)2-2,4,6-(N3)3-C6H (DNTA) and 1,3,5-(NO2)3-2-(N3)-C6H2 (TNMA) was studied experimentally using gas-phase IR spectroscopy …