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Showing 1 to 20 of 32 for “"Phenylacetylene"”.
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Phenylacetylene oligomers as synthetic information molecules
… synthetic information molecule is based on the phenylacetylene oligomer framework developed by Moore and co-workers. Recognition was achieved via a base-pair that is made from a single point high affinity H-bond, with phenol as the H-bond donor (D) and phosphine oxide as the H-bond acceptor (A). …
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The Synthesis, Characterization, and Properties of Stiff, Hydrophilic, Dendritic, Phenylacetylene Macromolecules
A series of phenylacetylene dendrimers bearing t-butyl ester groups on their periphery were prepared by a modified convergent growth scheme. The structures of these organic soluble compounds were confirmed by a variety characterization techniques including NMR, mass spectrometry, elemental …
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Pyridine carboxamide and pyrazole palladium(II) complexes as catalyst precursors for phenylacetylene polymerization
The objectives of this project were to synthesize and characterise pyridine carboxamide ligands and their palladium complexes and investigate their catalytic activity in the polymerization process of phenylactylene.
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Solvophobically-Driven Folding of Non-Biological Oligomers and the Solid Phase Synthesis of Phenylacetylene Oligomers
The ordered sequence of monomers in phenylacetylene oligomers can serve as a repeating motif to produce helical structures in solution which posses a tubular cavity. Calculations with modest size oligomers show stable helical conformations with as few as 8 monomer units. Oligomers with triglyme …
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Synthesis of phenylacetylene macrocycles and macrobicycles and their organization in solution, at the air-water interface and on solid surfaces
This dissertation outlines the synthesis of phenylacetylene macrocycles and macrobicycles. The aggregation of these molecules in solution and their organization at the air-water interface on solid surfaces are also studied. The efficient method for synthesizing linear or branched sequences of …
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"Part A. Functional Modular Phenylacetylene Units: A ""Molecular Turnstile."" Part B. Progress Towards an Electrochemically Active 9-Phenylcarbazole Hyperbranched Polymer"
Part B. Progress towards a new family of hyperbranched polymers based on the condensation of an AB$\sb2$ 9-phenylcarbazole monomer 169 has been described. Initial condensation reactions have provided material of greater than 100,000 mw as determined by GPC. No estimate of the degree of branching …
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The Fabrication of Thermoelectric Materials Using Functionalised Silicon Nanoparticles
… Bi2Te3) due to their abundance and low toxicity. Phenylacetylene functionalised SiNPs have been synthesised using a bottom up approach. A cold pressed pellet of this material displays an electrical conductivity of 18.1 S m-1, in addition to a high Seebeck coefficient and a low thermal …
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Brønsted acid-catalyzed reaction of alkynyltrifluoroborates with acetals and ketals
… between acetals, ketals, and potassium phenylacetylene trifluoroborate salts. Excellent functional group tolerance is observed with this protocol including, halogen, nitrile, nitro, acid and carbonyl functionalities.
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Magnetic Resonance Studies of Three-Phase Heterogeneous Catalytic Hydrogenation Reactions
… involved in the hydrogenation of styrene and phenylacetylene, to understand the accuracy and reliability of the procedure. Hydrogenation reactions of styrene and phenylacetylene were carried out in a trickle bed reactor (TBR), under varying hydrogen concentrations. The catalyst bed was …
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Synthesis and Characterization of Aryl Phosphine Oxide Containing Thermoplastic Polyimides and Thermosetting Polyimides with Controlled Reactivity
… polyetherimides was investigated. Reactive phenylacetylene, acetylene and maleimide terminated poly(ether imide) oligomers were prepared and characterized. Optimal reaction conditions were established to produce fully endcapped oligomers with imidized structures and controlled molecular …
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Non-traditional catalysis by plasmonic nanostructures
… complex in the carboxylation of alkynes. Phenylacetylene was used as the model alkyne. A systematic investigation was conducted to identify the roles played by the base (Cs2CO3), atmospheric conditions (CO2 saturated versus ambient), and each catalytic component, the Ag-NHC and AgNPs, both …
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Polymer Chemistry for Improved Self -Healing Composite Materials
… An alternative catalyst system based on WCl6, phenylacetylene, and nonylphenol has also been developed. In addition to these microcapsule-based materials, work toward self-healing based on stress-activation of polymerization is described. As a prerequisite to developing this technology, …
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GROWTH MECHANISMS OF COMPLEX ORGANICS IN THE GAS PHASE AND ON METAL NANOPARTICLES GENERATED BY A LASER VAPORIZATION PROCESS
… is found to follow the Bittner-Howard mechanism. Phenylacetylene and styrene radical cations reactions with acetylene are also studied and the addition of one acetylene molecule to the radical cation is observed. The second order rate constant of the product ions is found to be in the order of …
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Synthesis characterization, and reactivity of ruthenium maltolato complexes
… have the ability to catalyze the dimerization of phenylacetylene to a 1:1 mixture of E- and Z-1,4-diphenylbutenyne.Possible reactions of terminal acetylenes with transition metal complexes are discussed and a mechanism for the dimerization reaction is proposed.
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Electronic Energy Transfer in Conjugated Organic Dendrimers and Polymers
"This study examines energy transfer in phenylacetylene (PA) dendrimers and the conjugated polymer poly(2-methoxy 5-[2'-ethylhexyloxy]-p-phenylene vinylene) (MEH-PPV). The fundamental absorbing and emitting chromophores in the PA dendrimers are elucidated via steady-state and time-resolved …
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The 'Indenyl Effect' in iridium(I) olefin complexes
… carbon monoxide, ethylene, or phenylacetylene; CpIr($\eta\sp2$-C$\sb8$H$\sb{14}$)CO was not reactive under identical or more severe conditions. The complex ($\eta\sp5$-C$\sb9$H$\sb7$)Ir($\eta\sp2$-C$\sb8$H$\sb{14}$)CO readily oxidatively added C-Br and Si-H bonds, again under …
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Die metatesepolimerisasie van alkyne
The alkyne, phenylacetylene was polymerized in the presence of molybdenehexacarbonyl and different phenolic cocatalysts via catalytic polymerization. The reaction was monitored using a gaschromatographic method. The structural and morphological entities of polyphenylacetylene as well as the role of …
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Fabrication and Characterization of Electrical Contacts for Charge Transport Study in Molecular Electronics.
… assembled on the nanoscale electrode gap. Oligo Phenylacetylene-bridged gold nanoparticle dimer was prepared for the demonstration. Resistance measured at low bias regime is 2.2 ± 0.64 GΩ at room temperature, which is comparable with the single molecule conduction. The selective adsorption of SAM …
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The chemistry of zinc hydrides.
… rather than at the alkene, while with phenylacetylene, matters were complicated by competing elimination reactions. Product distribution was controlled by steric effects in the complex zinc hydrides. A possible mechanism for the addition of [Me[2]NC[2]H[4]OZnH][2] to trans-2-pentene was …
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Synthetic routes to asymmetrical Alkylenediimidosulfites and Novel Heteroarene-linked Bis-diimidosulfinates and Bis-triimidosulfonates
… was confirmed by the fact that methyl- and phenylacetylene-triimidosulfonate were the only known alkylsulfonates. Nevertheless, the addition of several lithiumheteroarenes to sulfurtriimide worked without difficulties. If the shape of the nucleophile permits to slot in between the NtBu …
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