A (hydroxo)oxoiron(V) oxidant has been implicated in cis-dihydroxylation reactions catalysed by Rieske dioxygenases and biomimetic non-haem iron complexes, but with only indirect proof of its existence. Variable-temperature mass spectrometry now provides persuasive evidence for just such a reactive intermediate in a synthetic system.
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McDonald, A., Que, L. Elusive iron(V) species identified. Nature Chem 3, 761–762 (2011). https://doi.org/10.1038/nchem.1153
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DOI: https://doi.org/10.1038/nchem.1153
