The development of cationic zinc complexes as a new class of lactide polymerization catalyst

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dc.contributor.authorWheaton, Craig Andrew
dc.contributor.supervisorHayes, Michael
dc.date.accessioned2012-08-15T16:56:58Z
dc.date.available2012-08-15T16:56:58Z
dc.date.issued2011
dc.descriptionxxiv, 254 leaves : ill. ; 29 cm + 1 CD-ROMen_US
dc.description.abstractThe thesis outlines the development of novel cationic zinc complexes for application in lactide polymerization catalysis. These complexes were characterized spectroscopically and crystallographically, and where appropriate their efficacy as catalysts for the polymerization of lactide was evaluated. The strongly donating, neutral chelating ligands employed in this study were prepared by installation of either one or two phosphinimine donors on a dibenzofuran backbone. An efficient synthetic methodology was then developed for the synthesis of cationic complexes of the formula [LZnE+][BAr4-], wherein E = C2H5, CH3, Ph, C6F5, OAc, OC6F5, or methyl-(D,L)-lactate, and AR = Ph, C6F5, or m-(CF3)2-C6H3. Only the cationic zinc-lactate species were found to be highly active polymerization catalysts. Tuning of the steric and electronic properties of the ligand resulted in the discovery of zinc-lactate systems that promote rapid and well-controlled polymerization of lactide under mild conditions, marking the first well-defined cationic metal catalysts to do so.en_US
dc.identifier.urihttps://hdl.handle.net/10133/3108
dc.language.isoen_USen_US
dc.publisherLethbridge, Alta. : University of Lethbridge, Dept. of Chemistry and Biochemistry, 2011en_US
dc.publisher.departmentDepartment of Chemistry and Biochemistryen_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectZinc compoundsen_US
dc.subjectPolymerization -- Researchen_US
dc.subjectMetal catalysts -- Researchen_US
dc.subjectComplex compoundsen_US
dc.subjectCoordination compoundsen_US
dc.subjectDissertations, Academicen_US
dc.titleThe development of cationic zinc complexes as a new class of lactide polymerization catalysten_US
dc.typeThesisen_US
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