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Showing 1 to 20 of 268 for “"Metathesis"”.
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Studies in Metathesis Polymerisation
… which, on addition of aluminium alkyl, produce metathesis-active complexes. Dilatometric and calorimetric techniques have been used to study the kinetics of the reaction. Previous studies conceming the kinetics of the initiation of polymerisation were confirmed using the dilatometric technique. …
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Defining peptide structure with metathesis.
… and biomaterials, primarily using olefin metathesis chemistry. Metathesis is chosen for the manipulation of peptide structure in order to induce conformational constraint in novel macrocyclic peptidomimetic inhibitors and to develop novel hydrogel matrices, which are of importance in the …
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Self-Condensing Ring-Opening Metathesis Polymerization
Ring-opening metathesis polymerization (ROMP) is a great tool for synthesizing polyolefin materials with different topologies, including hyperbranched polymers—polymers with high degrees of branching and many end groups. However, hyperbranched polymer synthesis via ROMP is challenging due to …
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Improvement of propylene yield via butene metathesis
… One of the technologies available is 1-butene metathesis, which describes a one-step process where isomerisation of 1-butene to 2-butene followed by cross-metathesis taking place. Products of the cross metathesis are propene and 2-pentene. In addition ethene and 3-hexene are expected as …
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Kinetic studies of the metathesis of 1-hexene using Re2O7/γ-Al2O3 and the synthesis and metathesis of oxazolines
The kinetics of the metathesis of 1-hexene using Re2O7/-Al_2O_3 as the catalyst were investigated under a variety of conditions. The experiments were carried out under high vacuum conditions. The product solutions were characterised by gas liquid chromatography and mass spectroscopy. The initial …
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Metal-Free Photoredox-Mediated Ring Opening Metathesis Polymerization
Metal-free, photoredox-mediated ring-opening metathesis polymerization (MF-ROMP) is a novel approach to the synthesis of ROMP polymers. Whereas traditional, metal-mediated ROMP uses well-defined transition metal-alkylidene initiators in stoichiometric amounts, MF-ROMP uses a photo-oxidant to …
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A mechanistic study of the olefin metathesis reaction
Thesis (M.S.)--Michigan State University. Dept. of Chemistry, 1972
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Mechanisms and catalyst design for heterogeneous Olefin metathesis
Olefin metathesis offers a promising technology for on-purpose production of propylene and has been implemented in several industrial processes including the Lummus Olefin Conversion Technology. However, current metathesis technology cannot produce propylene cheaply and efficiently due to reliance …
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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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The evolution of molybdenum and tungsten olefin metathesis catalysts
… prepared for highly Z-selective homocoupling metathesis of terminal olefins. Substrates screened were: 1-hexene, 1-octene, allylbenzene, allyltrimethylsilane, methyl-9-decenoate, methyl- 10-undecenoate, allylboronic acid pinacol ester, allylbenzylether, allyltosylamide, Nallylaniline, …
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Ligand variation in molybdenum asymmetric ring-closing metathesis catalysts
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2002.
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Highly functionalized piperidines via ring-closing metathesis of dehydroamino acids
Contains fulltext : 126486.pdf (Publisher’s version ) (Open Access)
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Studies of Metathesis for Materials Applications: Present and Future Possibilities
… synthesis. Among such transformations, olefin metathesis (OM) occupies a position of pre-eminent significance. Alkyne metathesis holds great promise, but remains in a much lower state of development. The OM-directed work in this thesis sought to advance the state of the art in living, …
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Molybdenum alkylidene complexes : syntheses and applications to olefin metathesis reactions
… Characterization and Activity as Chiral Olefin Metathesis Catalysts. Molybdenum olefin metathesis catalysts that contain previously unexplored aliphatic 1- phenylcyclohexylimido (PhCyN) and 2-phenyl-2-adamantylimido (PhAdN) groups were prepared and shown to be efficient and selective in a …
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Dipyrazolylphosphanes in Condensation and P–N/P–P Bond Metathesis Reactions
… are established and reviewed including salt metathesis,4a,14 dehalosilylation15 and dehalostannylation16 reactions, base promoted dehydrohalogenation reactions17 and dehydrogenative coupling reactions mediated by main group compounds18 or catalysis by transition metals.5,19 Moreover, …
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Synthesis and Characterisation of Tertiary Diallylalkylammonium Ionic Liquids and Their Metathesis
… of between 4.9 and 5.2 V. ii Acyclic diene metathesis (ADMET) polymerisation produced cyclic products rather than the desired polymeric materials. Diallylhexylammonium [BF4]¯ and [PF6]¯ gave 100% conversion to cyclic products, whilst the conversion decreased to 46 and 25% for the …
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Dual-component systems for storable frontal ring-opening metathesis polymerization resins
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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