Abstract: The extremely unstable iron-oxygen intermediates formed in bioinspired catalyst systems based on dinuclear ferric complexes with aminopyridine ligands containing electron-donating substituents, H2O2 and acetic acid have been detected by EPR spectroscopy for the first time. The detected intermediates are highly reactive and selective towards electron-rich alkene epoxidation even at −85 °C. They exhibit rhombic EPR spectra with the main values of g-tensor close to those of known oxoiron(V) complexes. On the basis of this similarity and reactivity data, we have assigned the observed intermediates to the oxoiron(V) [(L)FeV=O(OC(O)CH3)]2+ active species of selective alkene epoxidation by the catalyst systems studied herein.

Cite: Lyakin O.Y. , Zima A.M. , Bryliakov K.P. , Talzi E.P.
EPR Spectroscopic Study of the Active Species of Iron-Catalyzed Enantioselective Epoxidation
In compilation EuropaCat XII. Catalysis: Balancing the use of fossil and renewable resources. XII European Congress on Catalysis, Kazan (Russia), 30 August - 4 September, 2015 : Book of Abstracts. – BIC SB RAS., 2015. – C.1856-1857. – ISBN 978-5-906376-10-7.

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