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Titel:Octahedral Chiral-at-Metal Iridium and Rhodium Complexes as Versatile Asymmetric Catalysts
Autor:Shen, Xiaodong
Weitere Beteiligte: Meggers, Eric (Prof. Dr. )
Veröffentlicht:2016
URI:https://archiv.ub.uni-marburg.de/diss/z2016/0121
URN: urn:nbn:de:hebis:04-z2016-01214
DOI: https://doi.org/10.17192/z2016.0121
DDC:540 Chemie
Titel (trans.):Oktaedrische Iridium- und Rhodium- Komplexe mit metallzentrierter Chiralität als vielseitige asymmetische Katalysatoren
Publikationsdatum:2016-05-25
Lizenz:https://rightsstatements.org/vocab/InC-NC/1.0/

Dokument

Schlagwörter:
photoaktivierte, Octahedral, asymmetische Katalyse, Oktaeder, metallzentrierter Chiralität, Asymmetric Catalysis, Photoactivate, Chiral at Metal

Summary:
Over the past several years, our group has been interested in designing and synthesizing different novel octahedral chiral-at-metal complexes and their application in asymmetric catalysis, including visible-light-induced asymmetric catalysis. This thesis mainly includes two parts: one is the versatile asymmetric catalysis by octahedral chiral-at-metal iridium complexes, and the other one is the visible-light-promoted asymmetric α-amination by octahedral chiral-at-metal rhodium complex. In the first part of this thesis, octahedral chiral-at-metal iridium complexes IrS and IrO are used as highly effective chiral Lewis acid catalysts for a variety of asymmetric reactions, including Friedel-Crafts alkylations, Michael additions with CH-acidic compounds, 1,3-dipolar cycloadditions, Diels Alder cycloadditions, hetero Diels Alder cycloadditions and Henry reactions. In the second part of the thesis, a very efficient photoactivated enantioselective radical amination of 2-acyl imidazoles catalyzed by an octahedral chiral-at-metal rhodium complex RhO is introduced. Rhodium complex here serves a dual function, namely as a chiral Lewis acid to catalyze asymmetric enolate chemistry and furthermore as a light-activated smart initiator of a radical chain process.


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