Early Transition Metal CCC-NHC Pincer Complexes: Synthesis, Characterization, and Catalysis

The previously reported amine elimination methodology for the metalation of CCC-NHC pincer ligand precursors has been extended to other early-transition metals and ligands. Specifically, synthetic results for the preparation of imidazole based CCC-NHC pincer Ti (IV), CCC-NHC pincer Ta (V) will be discussed. In addition, the synthesis of a new triazole based CCC-NHC pincer ligand precursor and its metalation with Ta (V) will be presented. Coordination sphere manipulation of the new pincer complexes using TMSCl for the Ti complex and lithium t-butylamide for the Ta complexes is also discussed. The reaction of the initial Ta CCC-NHC complex with lithium t-butylamide is of particular interest as it is the first X-ray crystallographically determined molecular structure of an early-transtion metal anionic N-heterocyclic carbine complex. Catalytic results in hydroamination/cyclization with the Ti complexes and oxidative amination using the Ta complexes will also be reported.

Name thesis:degree_name

Ph.D. in Chemistry

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Chemistry and Biochemistry

Year dc:date.available

2013

Author dc:creator

• Helgert, Theodore Rudy

Contributors dc:contributor

• Thedford K. Hollis
• Daniel Mattern
• Mitchell A. Avery

• CCC-NHC
• N-Heterocyclic Carbene
• Pincer
• Tantalum
• Titanium
• Chemistry

Repository record dc:identifier

https://egrove.olemiss.edu/etd/1364

OAI identifier oai:identifier

oai:egrove.olemiss.edu:etd-2363