Synthesis and Reactivity of Manganese and Iron Pincer Complexes Towards Hydroboration

dc.contributor.advisorTonzetich, Zachary J.
dc.contributor.authorNarro Laborin, Ana Loreto
dc.contributor.committeeMemberSchanze, Kirk
dc.contributor.committeeMemberLarionov, Oleg
dc.contributor.committeeMemberMusie, Ghezai
dc.date.accessioned2024-02-12T18:28:05Z
dc.date.available2024-02-12T18:28:05Z
dc.date.issued2022
dc.descriptionThis item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.
dc.description.abstractIn recent years, a growing number of 1st row transition metal complexes have been shown to be highly active for the hydroboration of alkenes and alkynes. The work discussed herein describes a series of Mn and Fe complexes supported by a pyrrole-based pincer ligand, RPNP (PNP = anion of 2,5-bis(dialkylphosphinomethyl)pyrrole, R = t Bu, Cy), and their applications in hydroboration catalysis. Chapter 2 discusses the synthesis of novel manganese complexes of the tBuPNP and CyPNP ligands as potential hydroboration catalysts. Reaction of [MnBr(CO)5] with either Na(CyPNP) or Li(tBuPNP) afforded a series of Mn(I) carbonyl complexes of the type [Mn(CO)n( RPNP)]. The compounds were found to be unreactive toward hydroboranes but did undergo clean ligand dehydrogenation in the presence of benzoquinone. In addition to the Mn(I) complexes, reduction of [Mn(CO)2( tBuPNP)] with KC8 generated a rare example of a stable Mn(0) pincer complex with a metal-based radical. Chapter 3 describes detailed mechanistic studies on the hydroboration of internal alkynes utilizing iron-hydride and iron-boryl complexes supported by tBuPNP. Key species such as [Fe(CHCH2)(tBuPNP)] and [Fe(Bcat)(tBuPNP)], as well as insertion products of alkynes into the Fe-B bond were isolated and fully characterized. Mechanistic studies revealed a pathway for hydroboration involving the iron-hydride as the active species. Chapter 4 details a series of iron-boryl complexes of the CyPNP and their reactivity toward hydroboration, nitrile de-cyanation, and alkene C-H borylation. The structure, spectroscopy, and reactivity of the compounds are presented and compared to related iron species thought to play a role in catalytic hydrofunctionalization protocols.
dc.description.departmentChemistry
dc.format.extent190 pages
dc.format.mimetypeapplication/pdf
dc.identifier.isbn9798841766094
dc.identifier.urihttps://hdl.handle.net/20.500.12588/4667
dc.languageen
dc.subjectCatalysis
dc.subjectHydroboration
dc.subjectIron pincer
dc.subjectManganese pincer
dc.subjectOrganometallic Chemistry
dc.subjectPincer Complex
dc.subject.classificationInorganic chemistry
dc.subject.classificationChemistry
dc.titleSynthesis and Reactivity of Manganese and Iron Pincer Complexes Towards Hydroboration
dc.typeThesis
dc.type.dcmiText
dcterms.accessRightspq_closed
thesis.degree.departmentChemistry
thesis.degree.grantorUniversity of Texas at San Antonio
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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