A class of phosphonium cyclopentadienylide ligands was first reported in 1956 by Ramirez and Levy, who synthesized triphenylphosphonium cyclopentadienylide. They discovered that this ylide was unusually inert, for instance being unreactive with ketones; they attributed this unusual stability to its ability to undergo charge delocalization. It was subsequently found that the ylide coordinates to metals in η5 fashion, and thus one might anticipate a rich chemistry involved with these ligands, although surprisingly little research on this
fascinating ligand has been reported over the past 50 years. More recently, the
coordination chemistry of its analogous compound, methyldiphenylphosphonium
cyclopentadienylide, has been investigated, specifically using group six transition
metals. As an extension of the latter work, we have now successfully developed a
general synthetic route to similar phosphonium 1-indenylide compounds, IndPL3
(L3 = Ph3, PMePh2, PMe2Ph).
The coordination of these compounds is of particular interest given that the
compounds that form exhibit planar chirality and, as a result, enantioselective
catalytic properties are anticipated. Furthermore, reactions involving two molar
equivalents of phosphonium 1-indenylide, where two ligands coordinate, would
produce diastereomers.It was our attempt to extend this work to group 4 metal
halides, specifically to form coordination compounds of the type [TiCl3(IndPL3)]Cl
and [TiCl2(IndPL3)2]Cl2. These compounds could be of great importance as
enantioselective polymerization catalysts, or alternatively anti-cancer agents. / Thesis (Master, Chemistry) -- Queen's University, 2010-04-09 08:43:16.931
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OKQ.1974/5528 |
| Date | 13 April 2010 |
| Creators | Littlefield, Shalyn |
| Contributors | Queen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.)) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. |
| Relation | Canadian theses |
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