{"id":{"repo_id":"mississippi","oai_identifier":"oai:egrove.olemiss.edu:etd-2363"},"canonical_url":"https://search.dev.ndltd.org/etd/mississippi/oai:egrove.olemiss.edu:etd-2363","repository":{"repo_id":"mississippi","name":"University of Mississippi","base_url":"https://egrove.olemiss.edu/do/oai/"},"display":{"title":"Early Transition Metal CCC-NHC Pincer Complexes: Synthesis, Characterization, and Catalysis","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Helgert, Theodore Rudy"],"institution":null,"degree_name":"Ph.D. in Chemistry","degree_level":"Dissertation","degree_discipline":"Chemistry and Biochemistry","degree_department":null,"school":null,"contributors":["Thedford K. Hollis","Daniel Mattern","Mitchell A. Avery"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-01-01T08:00:00Z","date_published":"2013-01-01T08:00:00Z","updated_at":"2026-07-24T03:06:44Z","subjects":["CCC-NHC","N-Heterocyclic Carbene","Pincer","Tantalum","Titanium","Chemistry"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://egrove.olemiss.edu/etd/1364","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Thedford K. Hollis","Daniel Mattern","Mitchell A. Avery"]},{"key":"dc:creator","label":"Author","values":["Helgert, Theodore Rudy"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2020-01-23T08:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry and Biochemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D. in Chemistry"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["CCC-NHC","N-Heterocyclic Carbene","Pincer","Tantalum","Titanium","Chemistry"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://egrove.olemiss.edu/etd/1364"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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."]},{"key":"dc:title","label":"Title","values":["Early Transition Metal CCC-NHC Pincer Complexes: Synthesis, Characterization, and Catalysis"]}]}],"canonical_facts":{"dc:contributor":["Thedford K. Hollis","Daniel Mattern","Mitchell A. Avery"],"dc:creator":["Helgert, Theodore Rudy"],"dc:date.available":["2020-01-23T08:00:00Z"],"dc:description.abstract":["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."],"dc:identifier":["https://egrove.olemiss.edu/etd/1364"],"dc:subject":["CCC-NHC","N-Heterocyclic Carbene","Pincer","Tantalum","Titanium","Chemistry"],"dc:title":["Early Transition Metal CCC-NHC Pincer Complexes: Synthesis, Characterization, and Catalysis"],"thesis:degree_discipline":["Chemistry and Biochemistry"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D. in Chemistry"]},"updated_at":"2026-07-24T03:06:44Z"}