Mathematisch-Naturwissenschaftliche Fakultät

Institut für Organische Katalyseforschung

Fachgebiet: Homogene Katalyse

Betreuer: Prof. Dr. Matthias Beller

Diplom-Chemiker Gerrit Wienhöfer
(e-mail: )

Development of Novel Iron- and Ruthenium-Catalysts for Selective Redox-Reactions: Oxidation of Arenes and Reduction of Nitroarenes, Aldehydes and Terminal Alkynes

This thesis describes the development of novel methods for selective oxidation and reduction reactions based on the concept of “Green Chemistry”. The work focuses on the replacement of precious metal-catalysts, e.g. ruthenium-complexes, by cheaper, more abundant and less or non-toxic iron based catalysts. In the oxidation section, protocols for the selective transformation of arenes to their corresponding quinones are reported applying hydrogen peroxide. At first, a ruthenium-based procedure was developed which is replaced in a second step by an analogue in situ generated iron-based system. When focussing on reduction reactions, well-defined iron-tetraphos catalysts were used for the transfer hydrogenation of nitroarenes, terminal alkynes and aldehydes using formic acid as reducing agent. A second iron-tetraphos generation utilizes molecular hydrogen for the selective reduction of nitroarenes or aldehydes. Furthermore, homogeneous molybdenum-catalysts as well as heterogeneous iron- and cobalt-catalysts were applied for the reduction of nitroarenes.