Metathesis Catalysts in Tandem Catalysis: Methods and Mechanisms for Transformation

FieldValue
dc.contributor.authorBeach, Nicholas James
dc.date.accessioned2012-04-18T15:44:23Z
dc.date.available2012-04-18T15:44:23Z
dc.date.created2012
dc.date.issued2012
dc.identifier.urihttp://hdl.handle.net/10393/22731
dc.identifier.urihttp://dx.doi.org/10.20381/ruor-5629
dc.description.abstractThe ever-worsening environmental crisis has stimulated development of less wasteful “green” technologies. To this end, tandem catalysis enables multiple catalytic cycles to be performed within a single reaction vessel, thereby eliminating intermediate processing steps and reducing solvent waste. Assisted tandem catalysis employs suitable chemical triggers to transform the initial catalyst into new species, thereby providing a mechanism for “switching on” secondary catalytic activity. This thesis demonstrates the importance of highly productive secondary catalysts through a comparative hydrogenation study involving prominent hydrogenation catalysts of tandem ring-opening metathesis polymerization (ROMP)-hydrogenation, of which hydridocarbonyl species were proved superior. This thesis illuminates optimal routes to hydridocarbonyls under conditions relevant to our ROMP-hydrogenation protocol, using Grubbs benzylidenes as isolable proxies for ROMP-propagating alkylidene species. Analogous studies of ruthenium methylidenes and ethoxylidenes illuminate optimal routes to hydridocarbonyls following ring-closing metathesis (RCM) and metathesis quenching, respectively. The formation of unexpected side products using aggressive chemical triggers is also discussed, and emphasizes the need for cautious design of the post-metathesis trigger phase.
dc.language.isoen
dc.publisherUniversité d'Ottawa / University of Ottawa
dc.subjectmetathesis
dc.subjecthydridocarbonyl
dc.subjectruthenium
dc.subjecttandem catalysis
dc.subjecthydrogenation
dc.titleMetathesis Catalysts in Tandem Catalysis: Methods and Mechanisms for Transformation
dc.typeThesis
dc.faculty.departmentChimie / Chemistry
dc.contributor.supervisorFogg, Deryn
dc.embargo.termsimmediate
dc.degree.namePhD
dc.degree.leveldoctorate
dc.degree.disciplineSciences / Science
thesis.degree.namePhD
thesis.degree.levelDoctoral
thesis.degree.disciplineSciences / Science
uottawa.departmentChimie / Chemistry
CollectionThèses, 2011 - // Theses, 2011 -

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