{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/107561"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/107561","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Mechanistic studies on palladium-catalyzed C-N cross-coupling reaction","abstract":"Mechanistic studies on the palladium catalyzed C-N bond-forming reaction were carried out to generate a more complete understanding of the catalytic cycle. To understand this reaction, several kinetic studies employing simple aryl halide and amine coupling partners were performed to elucidate unknown reaction pathways. Chapter 1. The resting state for the palladium catalyzed cross-coupling of various diarylamines and aryl halides is found to be the diphenylamido complex. Kinetic studies of the catalytic reaction are used to generate an Eyring plot. Hammett studies were performed for both the aryl halide and diarylamine coupling partners. The rates of reductive elimination for catalysts based on the biaryl ligands XPhos, CyJohnPhos, CPhos, BrettPhos, RuPhos, and SPhos were evaluated. Analogues of SPhos demonstrated that electron-donation of the lower aryl group is key to the stability of the amido complex in accordance with theoretical calculations. The methoxy substituent at the C3 position is demonstrated to retard the overall rate of reductive elimination for a RuPhos-BrettPhos hybrid ligand. These studies demonstrate that reductive elimination is likely not a problematic step for C-N cross-couplings. Chapter 2. Kinetic experiments demonstrated an inverse dependence on the concentration of both amine and aryl halide coupling partners. These observations are demonstrated to be valid for several amine classes, aryl halides, and biaryl ligands. Some work is done to demonstrate mechanistic overlap with other bidentate ligands. Based on these studies, a simplified reaction network for oxidative addition is proposed which reproduces key features of the experimental system.","abstract_html":"Mechanistic studies on the palladium catalyzed C-N bond-forming reaction were carried out to generate a more complete understanding of the catalytic cycle. To understand this reaction, several kinetic studies employing simple aryl halide and amine coupling partners were performed to elucidate unknown reaction pathways. Chapter 1. The resting state for the palladium catalyzed cross-coupling of various diarylamines and aryl halides is found to be the diphenylamido complex. Kinetic studies of the catalytic reaction are used to generate an Eyring plot. Hammett studies were performed for both the aryl halide and diarylamine coupling partners. The rates of reductive elimination for catalysts based on the biaryl ligands XPhos, CyJohnPhos, CPhos, BrettPhos, RuPhos, and SPhos were evaluated. Analogues of SPhos demonstrated that electron-donation of the lower aryl group is key to the stability of the amido complex in accordance with theoretical calculations. The methoxy substituent at the C3 position is demonstrated to retard the overall rate of reductive elimination for a RuPhos-BrettPhos hybrid ligand. These studies demonstrate that reductive elimination is likely not a problematic step for C-N cross-couplings. Chapter 2. Kinetic experiments demonstrated an inverse dependence on the concentration of both amine and aryl halide coupling partners. These observations are demonstrated to be valid for several amine classes, aryl halides, and biaryl ligands. Some work is done to demonstrate mechanistic overlap with other bidentate ligands. Based on these studies, a simplified reaction network for oxidative addition is proposed which reproduces key features of the experimental system.","abstract_has_math":false,"creators":["Arrechea, Pedro Luis"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Chemistry.","school":null,"contributors":[],"advisors":["Stephen L. Buchwald."],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016","date_published":"2016","updated_at":"2026-07-22T22:21:29Z","subjects":["Chemistry."],"languages":["eng"],"rights":["MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/107561","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Stephen L. Buchwald."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Department of Chemistry."]},{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["Massachusetts Institute of Technology. Department of Chemistry."]},{"key":"dc:creator","label":"Author","values":["Arrechea, Pedro Luis"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2017-03-20T19:40:09Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2017-03-20T19:40:09Z"]},{"key":"dc:date.issued","label":"Date","values":["2016"]},{"key":"dc:publisher","label":"Institution","values":["Massachusetts Institute of Technology"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Chemistry."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/107561"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis: Ph. D. in Organic Chemistry, Massachusetts Institute of Technology, Department of Chemistry, 2016.","Cataloged from PDF version of thesis.","Includes bibliographical references."]},{"key":"dc:description.abstract","label":"Abstract","values":["Mechanistic studies on the palladium catalyzed C-N bond-forming reaction were carried out to generate a more complete understanding of the catalytic cycle. To understand this reaction, several kinetic studies employing simple aryl halide and amine coupling partners were performed to elucidate unknown reaction pathways. Chapter 1. The resting state for the palladium catalyzed cross-coupling of various diarylamines and aryl halides is found to be the diphenylamido complex. Kinetic studies of the catalytic reaction are used to generate an Eyring plot. Hammett studies were performed for both the aryl halide and diarylamine coupling partners. The rates of reductive elimination for catalysts based on the biaryl ligands XPhos, CyJohnPhos, CPhos, BrettPhos, RuPhos, and SPhos were evaluated. Analogues of SPhos demonstrated that electron-donation of the lower aryl group is key to the stability of the amido complex in accordance with theoretical calculations. The methoxy substituent at the C3 position is demonstrated to retard the overall rate of reductive elimination for a RuPhos-BrettPhos hybrid ligand. These studies demonstrate that reductive elimination is likely not a problematic step for C-N cross-couplings. Chapter 2. Kinetic experiments demonstrated an inverse dependence on the concentration of both amine and aryl halide coupling partners. These observations are demonstrated to be valid for several amine classes, aryl halides, and biaryl ligands. Some work is done to demonstrate mechanistic overlap with other bidentate ligands. Based on these studies, a simplified reaction network for oxidative addition is proposed which reproduces key features of the experimental system."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph. D. in Organic Chemistry"]},{"key":"dc:title","label":"Title","values":["Mechanistic studies on palladium-catalyzed C-N cross-coupling reaction"]}]}],"canonical_facts":{"dc:contributor.advisor":["Stephen L. Buchwald."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Chemistry."],"dc:contributor.other":["Massachusetts Institute of Technology. Department of Chemistry."],"dc:creator":["Arrechea, Pedro Luis"],"dc:date.accessioned":["2017-03-20T19:40:09Z"],"dc:date.available":["2017-03-20T19:40:09Z"],"dc:date.issued":["2016"],"dc:description":["Thesis: Ph. D. in Organic Chemistry, Massachusetts Institute of Technology, Department of Chemistry, 2016.","Cataloged from PDF version of thesis.","Includes bibliographical references."],"dc:description.abstract":["Mechanistic studies on the palladium catalyzed C-N bond-forming reaction were carried out to generate a more complete understanding of the catalytic cycle. To understand this reaction, several kinetic studies employing simple aryl halide and amine coupling partners were performed to elucidate unknown reaction pathways. Chapter 1. The resting state for the palladium catalyzed cross-coupling of various diarylamines and aryl halides is found to be the diphenylamido complex. Kinetic studies of the catalytic reaction are used to generate an Eyring plot. Hammett studies were performed for both the aryl halide and diarylamine coupling partners. The rates of reductive elimination for catalysts based on the biaryl ligands XPhos, CyJohnPhos, CPhos, BrettPhos, RuPhos, and SPhos were evaluated. Analogues of SPhos demonstrated that electron-donation of the lower aryl group is key to the stability of the amido complex in accordance with theoretical calculations. The methoxy substituent at the C3 position is demonstrated to retard the overall rate of reductive elimination for a RuPhos-BrettPhos hybrid ligand. These studies demonstrate that reductive elimination is likely not a problematic step for C-N cross-couplings. Chapter 2. Kinetic experiments demonstrated an inverse dependence on the concentration of both amine and aryl halide coupling partners. These observations are demonstrated to be valid for several amine classes, aryl halides, and biaryl ligands. Some work is done to demonstrate mechanistic overlap with other bidentate ligands. Based on these studies, a simplified reaction network for oxidative addition is proposed which reproduces key features of the experimental system."],"dc:description.degree":["Ph. D. in Organic Chemistry"],"dc:identifier.uri":["http://hdl.handle.net/1721.1/107561"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Chemistry."],"dc:title":["Mechanistic studies on palladium-catalyzed C-N cross-coupling reaction"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:21:29Z"}