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Iron in a Trigonal Tris(alkoxide) Ligand Environment

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journal contribution
posted on 18.03.2013 by Matthew B. Chambers, Stanislav Groysman, Dino Villagrán, Daniel G. Nocera
Mononuclear Fe­(II) and Fe­(III) complexes residing in a trigonal tris­(ditox) (ditox = tBu2(Me)­CO) ligand environment have been synthesized and characterized. The Fe­(III) ditox complex does not react with oxidants such as PhIO, whereas NMe3O substitutes a coordinated tetrahydrofuran (THF) in the apical position without undergoing oxo transfer. In contrast, the Fe­(II) ditox complex reacts rapidly with PhIO or Me3NO in THF or cyclohexadiene to furnish a highly reactive intermediate, which cleaves C–H bonds to afford the Fe­(III)–hydroxide complex. When generated in 1,2-difluorobenze, this intermediate can be intercepted to oxidize phosphines to phosphine oxide. The fast rates at which these reactions occur is attributed to a particularly weak ligand field imparted by the tris­(alkoxide) ancillary ligand environment.