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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 51 for “"Grubbs"”.
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Karakterisering van Grubbs-tipe prekatalisatore met behulp van kernmagnetiese resonansspektroskopie
… of the ruthenium containing precatalysts Grubbs 1 (1) and Grubbs 2 (2), there was an increase in the development of new precatalysts. The NMR characterization could not cope with this. The NMR characterization mainly consists of 1H, 31P, COSY and rarely 13C. Due to the high natural …
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Development and exploration of Schiff base ruthenium carbene catalysts for olefin metathesis
… of Schiff base substituted second generation Grubbs catalysts, bimetallic Schiff base substituted Grubbs catalysts, the development of new NHCs (N-Heterocyclic Carbene) for the 2nd generation Grubbs catalysts and a detailed investigation of secondary metathesis events. The Schiff base …
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'I am indebted to everyone': Susan Howe's Inheritance
… interlocutors: Joan Jonas, Fanny Howe, and David Grubbs. As such, the thesis is also a study of the interaction of experimental poetry with live and time-based art, and of the process of collaboration. Each chapter explores a different category of possessing or perceiving something in common with …
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A poetics of listening: sound as distant diapason delight in the work of Susan Howe
… shifts. Through her collaborations with David Grubbs, Howe has extended her disruptive spatial productions into the temporal dimension of performance. Actively listening to Grubbs' processing techniques in conjunction with Howe's reading can reveal a bias in our attention to `significant' …
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Development of Micro and Nanostructured Materials for Interfacial Self -Healing
… into the crack plane where it contacts the Grubbs' catalyst to initiate polymerization. Up to 44% recovery of virgin interfacial shear strength after full interfacial debonding is demonstrated. Additionally, no decrease in virgin interfacial shear strength for functionalized fibers is …
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Engineering approaches to control polymer architecture
… metathesis polymerization with third generation Grubbs catalyst. This chapter provides the mechanistic origins of the unique zero order kinetics of the third generation Grubbs catalyst, and details the implementation of this for polymer synthesis. Chapter 4 will cover the design of polymer …
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Novel encapsulation technologies for small size-scale self-healing applications
… of a silica shell. Polymer protection of Grubbs’ catalyst allows the catalyst to be incorporated into an epoxy matrix at smaller size scales without deactivation. The final particles contain catalyst encapsulated in particles made of polystyrene (PS) and polymethylmethacrylate (PMMA) and …
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New approaches to catalytic C-H and C-C bond cleavage with Ruthenium complexes
… focus on the olefin metathesis catalyzed by Grubbs catalyst [RuCl2(=CHPh)(PCy3)2] (4) successfully carried out in ionic liquid such as [emim][Tf2N] (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide). The products can be isolated by extraction with common organic solvents such as …
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Autonomic healing of low-velocity impact damage in woven fiber-reinforced composites
… and wax-encapsulated first generation Grubbs' catalyst microspheres, were premixed into the liquid epoxy, and panels are fabricated using a hand layup technique and compression molding. Low-velocity impact damage was introduced to these panels by drop-weight impact testing. To visually …
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Polymer Chemistry for Improved Self -Healing Composite Materials
… polymerization of endo-dicyclopentadiene using Grubbs' catalyst. The work herein describes improvements made to this original material. An improved technology is described which protects and delivers the catalyst within wax microspheres. This technique leads to greatly reduced required loadings …
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Self-healing of delamination damage in glass/epoxy composites using catalyst functionalized fibers
… are functionalized with second generation Grubbs’ catalyst using an evaporative crystallization technique for catalyst deposition. Preforms are then used in the manufacture of laminated 2D woven composites. Healing of interlaminar fracture damage is evaluated in these composites using …
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Fullerene hydrides and studies toward the syntheses of fulvalenes
… by a metathesis reaction using first generation Grubbs catalyst. The two precursors are attractive candidates for the parent compounds by using solid fluoride as the dehalosilylation inducing reagent in the final step.
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Conjugated polymer based materials via the incorporation of polymerizable units
… end-capped CPs became macroinitiators using Grubbs' catalysts, and they were used to prepare block copolymers by polymerizing ROMP monomers.
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Asymmetrische Synthese von Tarchonanthuslacton und Pironetin-Bausteinen
… acid furnished a double olefinic substrate for a Grubbs ring-closing metathesis. Furthermore an efficient and straight forward ten-step asymmetric synthesis of the polyketide tarchonanthuslactone in a good overall yield of 21% and excellent diastereomeric and enantiomeric excesses (de, ee >= 96%) …
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Self-healing of high temperature cured epoxy and composites
… dicyclopentadiene (DCPD) monomer and Grubbs’ first generation catalyst particles. Both quasi-static fracture and fatigue performance of a self-healing non-toughened epoxy adhesive were evaluated using the width-tapered-double-cantilever-beam (WTDCB) specimen geometry. The same healing …
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Fused and spiro furanones from tetronic acid synthons: Oxa and azacycles featuring the butenolide ring
… annulation by ring closing methathesis with Grubbs’ catalysts. Natural product pesthetoxin was prepared via a double Ph3PCCO addition to alpha-hydroxy benzyl octanoate, thus demonstrating the utility of keteneylidenetriphenylphosphorane as a C2O building block. Finally, …
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Synthesis Of Natural Product-Based Sphingosine Derivatives
… as a key step. Another crucial technique is the Grubbs' cross-metathesis reaction to the side-chain extension. This reaction provides an opportunity to develop various analogs through side-chain modification. Compound (±)-30 was synthesized in 11 steps and compound (±)-31 was synthesized in 10 …
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Progress Toward The Total Synthesis Of The Natural Product Herbicide Ascaulitoxin Aglycone
… olefin was successfully installed by using a Grubbs olefin metathesis reaction of benzyl protected D-allylglycine (homodimerization) with 2nd generation catalysts in the presence of copper iodide. Subsequent asymmetric Sharpless aminohydroxylation of the precursor olefin substrate resulted in …
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Studies of Metathesis for Materials Applications: Present and Future Possibilities
… Currently, the first- and third-generation Grubbs initiators, which exhibit the ease of handling characteristic of the late metal ruthenium, dominate ROMP applications. These initiators are characterized by extremes of reactivity, however. We describe the first ruthenium initiator capable of …
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Aerogels as diverse nanomaterials
… (pDCPD) based aerogels using two different Grubbs catalysts (GC-I and GC-II) with different catalytic activity towards ROMP. The different behavior of pDCPD aerogels was traced to a different polymer configuration at molecular level."--Abstract, page v.
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