Cobalt-Catalyzed Olefin Hydrogenation

by Sier Sang
Doctoral thesis
Date of Examination:2023-05-15
Date of issue:2023-08-04
Advisor:Prof. Dr. Sven Schneider
Referee:Prof. Dr. Sven Schneider
Referee:Prof. Dr. Inke Siewert
Persistent Address: http://dx.doi.org/10.53846/goediss-10011

 

 

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Abstract

English

This thesis describes the synthesis and isolation of the cobalt complexes, using PNP-pincer ligand system with tert-butyl substituents. The neutral and cationic cobalt hydrides were further probed in olefin hydrogenation to examine the influence of ligand bulkiness in the reaction rate. Photochemical reactivity in olefin hydrogenation was investigated using cobalt hydrde complex ligated with unsaturated ligand backbone. Substrate screening was carried out with mono-, di- and tri-substituted olefins ligated with aromatic or aliphatic substituents. Mechanistic investigation was performed by spectroscopic and kinetic studies. Photophysical processes was examined by transient spectroscopy to figure out the influence of photoexcitation and the corresponding photoproduct. The role of the photoproduct in hydrogenation was evaluated. Control reactions, hydrogenation of radical clock substrates and para-hydrogen molecules were introduced to gather more information about the reaction pathways.
Keywords: Olefin hydrogenation; Mechanistic investigation; Cobalt complexes
 
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