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Showing 1 to 20 of 246 for “"Alkyne"”.
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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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Towards Sacrificial Anode-Free Alkyne Electrocarboxylation
… and renewable carbon feedstock. However, current alkyne electrocarboxylation routes rely on sacrificial metal anodes which inhibit their scalability and implementation in continuous flow systems. The aim of this research is to establish a scalable, sacrificial anode-free electrocarboxylation …
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ESIPT-Enabled Alkyne Migration Provides Rapid Access to Benzoxazinones
… scaffold. Herein, we report a photochemical alkyne migration that provides rapid access to the benzoxazinone scaffold. This is the first reported photochemical synthesis of a benzoxazinone, and, to our knowledge, the first reported photochemical alkyne migration.</p>
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Synthesis of contorted nanographenes via multi-fold alkyne benzannulation reactions
… of contorted NGs by utilizing the non-oxidative, alkyne benzannu-lation reaction catalyzed by indium chloride and silver bis triflimide by exploiting high energy content of carbon-carbon triple bonds of the diyne precursors under a mild-reaction conditions. We employed two-fold …
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Understanding reaction pathways leading to tetrahedral organic cages via alkyne metathesis
… trapped tetrahedral cages synthesized via alkyne metathesis (chapter 2), an investigation of the origin of the kinetic trap (chapter 3), and the development of strategies to probe the dependence of reaction pathways on structural variables of the precursor (chapter 4). The investigation of …
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Isoxazole Linked siRNA Cholesterol Conjugates by Catalyst Free Nitrile Oxide/Alkyne Cycloadditions
… of nitrones and nitrile oxides with alkene and alkyne dipolarophiles Chapter 2 presents the somewhat disappointing findings on the cycloaddition reactions of maleimides. Reactions with “simple” maleimides suffered from poor yield and/or poor diastereoselectivity, and synthetic access to the …
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Effects of shape, conformation, and symmetry on macrocycle synthesis via alkyne metathesis
… Dynamic covalent chemistry (DCC), specifically alkyne metathesis, was used to elucidate and probe the structural parameters that favor efficient macrocycle synthesis, because it involves rapid, reversible reactions under thermodynamic control, yielding product distributions that are determined …
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Studies toward Augmented Carbene/Alkyne Cascade Reactions and Ruthenium Catalysts for Propargylic Substition
… for the synthesis of aplykurodinone 1. Alkyne/cascade reactions are highly effective processes in organic chemistry, and they can provide complex molecules in a single synthetic method. Our approach is based on a rhodium-catalyzed diazo-decomposition of readily available starting …
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Main Group Elements in Catalysis: Alkene/Alkyne Activation Using Organoaluminium(III)–Pyridyl Dimers
… new cationic Al(III)-based catalysts for alkene/alkyne polymerisation containing two active centres, with the potential to act co-operatively in stereoselective assembly. The focus of this study was organoaluminium pyridyl dimers of the type [R2Al(2- py')]2 (R = Me, iBu; py'= substituted pyridyl …
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Synthesis of 4-Azidocoumarins and Their Use in Copper-Catalyzed Azide-Alkyne Cycloaddition reactions
… were synthesized via a copper-catalyzed alkyne-azide cycloaddition (CuAAC) reaction. CuAAC reactions of the azides were optimized by screening of various copper catalysts 6 and copper tetrakis acetonitrile hexafluorophosphate ([Cu(CH3CN)4]PF6) gave the best results in the experiments …
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Synthetic and mechanistic studies to expand the scope of alkyne metathesis dynamic covalent chemistry
… through reversible covalent reactions. Alkyne metathesis has emerged as one of the most frequently applied reactions for the synthesis of shape-persistent molecular architectures via DCC. The scope of alkyne metathesis DCC has been rapidly expanding thanks to the development of …
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Synthesis and Evaluation of Trans-bilayer Cross Linking Phospholipids Based on Click (Azide-Alkyne) Chemistry
… containing terminal azide and terminal alkyne on the alkyl chain of sn2 position. Sn-glycero-3-phosphocholine (GPC) was used as glycerol back bone with two available hydroxyl groups for esterification. The first esterification was done using dibutyltin oxide as catalyst and palmitoyl …
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Development of a Highly Active Molybdenum Catalyst for Alkyne Metathesis and Its Application in Polymer and Macrocycle Synthesis
Made available in DSpace on 2015-09-25T22:13:29Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3199196.pdf: 5657805 bytes, checksum: c6c833dc3777c1d82e313b1d924659d5 (MD5) Previous issue date: 2005
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Zirconium-mediated alkyene-aldehyde coupling, rhodium-catalyzed alkene hydrothiolation, and copper-catalyzed alkyne hydroarylation: Reaction development and mechanistic investigations
… utilize ubiquitous starting materials such as alkynes and alkenes for the synthesis of compounds which are valuable synthetic intermediates or desirable final products which reduce the time and resources required compared to current methods. α,β-unsaturated carbonyl compounds are common …
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I. Kinetic and mechanistic studies of dynamic alkyne metathesis and II. Towards regenerative thermosets using frontal ring-opening olefin metathesis polymerization
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Investigation of the Structure of Alkyne Self-Assembled Monolayers on Gold and the Development of Matrix-Enhanced Secondary Ion Mass Spectrometry Methods
… The synthesis and characterization of terminal alkyne monolayers: TAMs) adsorbed on gold was investigated by RAIRS, single wavelength ellipsometry, time-of-flight secondary ion mass spectrometry: TOF SIMS) and x-ray photoelectron spectroscopy: XPS). TAMs have the potential to transform surface …
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