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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Novel Claisen rearrangement reactions

Mountford, David Mark January 2005 (has links)
No description available.
2

A study of a dual catalyst system in a one-stage synthesis of dimethyl ether from synthesis gas

Babbra, Neelkamaljeet Kaur January 2003 (has links)
No description available.
3

Studies towards the synthesis of clavilactones

Da Silva, Marianne Ines January 2005 (has links)
No description available.
4

Alkaline earth and rare earth complexes for the ring opening polymerisation of cyclic esters

Clark, Lawrence January 2012 (has links)
This Thesis describes the use of alkaline earth and rare earth complexes bearing phenolate ligands as catalysts in the amine-initiated, immortal ring opening polymerisation (ROP) of cyclic esters. Mechanistic elucidation was performed and two propagation pathways are presented. Chapter One introduces cyclic esters and catalytic routes to polyesters by ROP. Common techniques for polymer characterisation are described and an overview of relevant phenolate-supported ROP catalysts is given. Reversible chain transfer in ROP is also discussed. Chapter Two describes the synthesis and characterisation of zwitterionic Group 3 complexes bearing bis(phenolate)-amino ligands and the development of the amine-initiated, immortal ROP methodology using this class of catalyst. Detailed studies into the ROP of rac-lactide using amines and a zwitterionic yttrium complex are presented and the mechanism of amine-initiated, immortal ROP was derived. Chapter Three documents further amine-initiated, immortal ROP studies using a zwitterionic yttrium complex as the catalyst. The preparation of multiarm polymers is described and further investigations using the cyclic esters, ε-caprolactone and rac-β-butyrolactone are presented. Chapter Four describes the use of Group 2 and lanthanide phenolate complexes in the amine-initiated ROP of rac-lactide. Bulk polymerisation studies revealed the generality of the amine-initiated, immortal ROP methodology and an alternative propagation pathway was derived from mechanistic studies. Chapter Five details the synthesis and characterisation of Group 3 amide complexes supported by phenolate-amino ligands. Each complex was screened for ROP capability and amine co-initiators were employed. Chapter Six contains experimental details and characterisation data for the new complexes and polymer products described in this Thesis. CD Appendix contains crystallography .cif files, supporting information for each Chapter and spreadsheets containing polymerisation data.

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