{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/113158"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/113158","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Development of systems for isolation of high-valent nickel complexes and their reactivity","abstract":"Inspired by work published in our group utilizing macrocyclic nitrogen based pyridinophane (N4) and triazacyclononane (tacn) ligands for the isolation and study of high-valent nickel and palladium compounds, chiral variants of these ligands were synthesized in attempts to isolate high-valent organometallic nickel complexes that could play a role in enantioselective crosscoupling reactions. Utilizing readily available chiral pool primary amines, the synthesis of N4 type ligands can be amended to install chirality on the tertiary amines of the ligand, which commonly bind through dative interactions with the metal center in high-valent oxidation states. Furthermore, the synthesis can be expanded to N3 type pyridinophane compounds like N3CBr type ligands, allowing for on-ligand reactivity studies to be conducted. With these ligands in hand, a secondary organometallic nucleophile was synthesized which could allow for the synthesis of organometallic nickel complexes. The reactivity of these complexes was then examined, with hopes that insight into the role of high-valent complexes and the method for stereoinduction in enantioselective cross-coupling reactions could then be better understood. Furthermore, a synthetic route to novel chiral variants of triazacyclononane ligands was developed based on a ‘crab-like’ synthesis published by the Scarborough group in 2018. This synthesis relies on commercially available alpha-hydroxy acids, and the substituents on the ligand can be varied in a multitude of locations. This ligand synthesis allows for installation of chirality on the methylene backbone of the ligand, which will hopefully result in good chiral projection into the open binding sites of the metal complex. Further efforts to develop reactivity with this system are currently underway.","abstract_html":"Inspired by work published in our group utilizing macrocyclic nitrogen based pyridinophane (N4) and triazacyclononane (tacn) ligands for the isolation and study of high-valent nickel and palladium compounds, chiral variants of these ligands were synthesized in attempts to isolate high-valent organometallic nickel complexes that could play a role in enantioselective crosscoupling reactions. Utilizing readily available chiral pool primary amines, the synthesis of N4 type ligands can be amended to install chirality on the tertiary amines of the ligand, which commonly bind through dative interactions with the metal center in high-valent oxidation states. Furthermore, the synthesis can be expanded to N3 type pyridinophane compounds like N3CBr type ligands, allowing for on-ligand reactivity studies to be conducted. With these ligands in hand, a secondary organometallic nucleophile was synthesized which could allow for the synthesis of organometallic nickel complexes. The reactivity of these complexes was then examined, with hopes that insight into the role of high-valent complexes and the method for stereoinduction in enantioselective cross-coupling reactions could then be better understood. Furthermore, a synthetic route to novel chiral variants of triazacyclononane ligands was developed based on a ‘crab-like’ synthesis published by the Scarborough group in 2018. This synthesis relies on commercially available alpha-hydroxy acids, and the substituents on the ligand can be varied in a multitude of locations. This ligand synthesis allows for installation of chirality on the methylene backbone of the ligand, which will hopefully result in good chiral projection into the open binding sites of the metal complex. Further efforts to develop reactivity with this system are currently underway.","abstract_has_math":false,"creators":["Heberer, Neil Thomas"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["Mirica, Liviu M"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-01-12T22:35:06Z","date_published":"2022-01-12T22:35:06Z","updated_at":"2026-07-22T22:24:53Z","subjects":["nickel","high-valent, triazacyclononane","pyridinophane","organometallics","catalysis","cross-coupling"],"languages":["en"],"rights":["Copyright 2021 Neil Heberer"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/113158","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Mirica, Liviu M"]},{"key":"dc:creator","label":"Author","values":["Heberer, Neil Thomas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-01-12T22:35:06Z","2024-01-12T22:35:30Z","2021-07-16","2021-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["nickel","high-valent, triazacyclononane","pyridinophane","organometallics","catalysis","cross-coupling"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2021 Neil Heberer"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/113158"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Inspired by work published in our group utilizing macrocyclic nitrogen based pyridinophane (N4) and triazacyclononane (tacn) ligands for the isolation and study of high-valent nickel and palladium compounds, chiral variants of these ligands were synthesized in attempts to isolate high-valent organometallic nickel complexes that could play a role in enantioselective crosscoupling reactions. Utilizing readily available chiral pool primary amines, the synthesis of N4 type ligands can be amended to install chirality on the tertiary amines of the ligand, which commonly bind through dative interactions with the metal center in high-valent oxidation states. Furthermore, the synthesis can be expanded to N3 type pyridinophane compounds like N3CBr type ligands, allowing for on-ligand reactivity studies to be conducted. With these ligands in hand, a secondary organometallic nucleophile was synthesized which could allow for the synthesis of organometallic nickel complexes. The reactivity of these complexes was then examined, with hopes that insight into the role of high-valent complexes and the method for stereoinduction in enantioselective cross-coupling reactions could then be better understood. Furthermore, a synthetic route to novel chiral variants of triazacyclononane ligands was developed based on a ‘crab-like’ synthesis published by the Scarborough group in 2018. This synthesis relies on commercially available alpha-hydroxy acids, and the substituents on the ligand can be varied in a multitude of locations. This ligand synthesis allows for installation of chirality on the methylene backbone of the ligand, which will hopefully result in good chiral projection into the open binding sites of the metal complex. Further efforts to develop reactivity with this system are currently underway.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-08-01","The student, Neil Heberer, accepted the attached license on 2021-07-08 at 12:27.","The student, Neil Heberer, submitted this Thesis for approval on 2021-07-08 at 12:30.","This Thesis was approved for publication on 2021-07-16 at 15:04.","DSpace SAF Submission Ingestion Package generated from Vireo submission #16802 on 2022-01-12 at 12:54:00","Made available in DSpace on 2022-01-12T22:35:06Z (GMT). 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Utilizing readily available chiral pool primary amines, the synthesis of N4 type ligands can be amended to install chirality on the tertiary amines of the ligand, which commonly bind through dative interactions with the metal center in high-valent oxidation states. Furthermore, the synthesis can be expanded to N3 type pyridinophane compounds like N3CBr type ligands, allowing for on-ligand reactivity studies to be conducted. With these ligands in hand, a secondary organometallic nucleophile was synthesized which could allow for the synthesis of organometallic nickel complexes. The reactivity of these complexes was then examined, with hopes that insight into the role of high-valent complexes and the method for stereoinduction in enantioselective cross-coupling reactions could then be better understood. Furthermore, a synthetic route to novel chiral variants of triazacyclononane ligands was developed based on a ‘crab-like’ synthesis published by the Scarborough group in 2018. This synthesis relies on commercially available alpha-hydroxy acids, and the substituents on the ligand can be varied in a multitude of locations. This ligand synthesis allows for installation of chirality on the methylene backbone of the ligand, which will hopefully result in good chiral projection into the open binding sites of the metal complex. Further efforts to develop reactivity with this system are currently underway.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-08-01","The student, Neil Heberer, accepted the attached license on 2021-07-08 at 12:27.","The student, Neil Heberer, submitted this Thesis for approval on 2021-07-08 at 12:30.","This Thesis was approved for publication on 2021-07-16 at 15:04.","DSpace SAF Submission Ingestion Package generated from Vireo submission #16802 on 2022-01-12 at 12:54:00","Made available in DSpace on 2022-01-12T22:35:06Z (GMT). No. of bitstreams: 2 HEBERER-THESIS-2021.pdf: 3377966 bytes, checksum: ca9828dc9432fa3d35f0dadfe15748c4 (MD5) LICENSE.txt: 4209 bytes, checksum: 3c3e7355acfba1fd5c4cfc71bba4f1e0 (MD5) Previous issue date: 2021-07-16","Embargo set by: Seth Robbins for item 121084 Lift date: 2024-01-12T22:35:30Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/113158"],"dc:language":["en"],"dc:rights":["Copyright 2021 Neil Heberer"],"dc:subject":["nickel","high-valent, triazacyclononane","pyridinophane","organometallics","catalysis","cross-coupling"],"dc:title":["Development of systems for isolation of high-valent nickel complexes and their reactivity"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:53Z"}