Due to their ease of synthesis and their tendency toward making coordinatively unsaturated complexes, pyrazole substituted tris(pyrazolyl)borate (Tp) ligands serve as excellent scaffolds for activating small molecules such as dioxygen. Our group has previously reported various TpM<sup>I</sup>-L complexes (where M is Co, Fe, or Cr, and L is either N<sub>2</sub> or CO) which react with oxygen atom transfer reagents to give intramolecular C-H bond activation products. This presentation will describe substitutionally labile, low valent cobalt and iron complexes of ferrocenyl modified Tp ligands, taking advantage of the ferrocene fragment’s exceptionally strong C-H bonds to prevent intramolecular C-H bond activation. The synthesis, structural characteristics, and reactivity of these complexes toward oxygen transfer reagents, such as dioxygen and pyridine-N-oxide, will be discussed.

Iron and cobalt chemistry of ferrocenyl substituted hydrotris(pyrazolyl)borate ligands

251st National Meeting (2016)

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