Title

Synthesis and reactivity of early transition metal "Frustrated Lewis Pairs"

Date of Award

2008

Degree Type

Thesis

Degree Name

M.Sc.

Department

Chemistry and Biochemistry

Keywords

Chemistry, Inorganic.

Rights

CC BY-NC-ND 4.0

Abstract

Our research group recently introduced the new concept of "Frustrated Lewis Pairs" (FLP) wherein sterically demanding Lewis acids and bases do not interact in the expected donor-acceptor fashion, but rather exhibit unique reactivity. To date this concept of FLPs has been limited to main group systems. In this thesis we demonstrate that Lewis acidic early metal cations can activate small molecules in the presence of sterically demanding donors to exhibit unique reactivity. The cationic Lewis acids [Cp2Zr(O't'Bu)] +, [Cp2Zr(OPh)]+, [Cp2Zr(OMes)] + and [Cp2Zr(ODipp)]+ are generated by the reaction between the neutral precursor compound and methyl abstracting reagents [Ph3C][B(C6F5)4] and B(C 6F5)3. The reactions of these early metal cations, sterically hindered phosphines with molecular hydrogen and ethylene affords a unique route to early metal hydride species and olefin inserted products. Observed products were generated ' in-situ' and characterized fully by multinuclear 1-D and 2-D NMR spectroscopy.