New chelating bis(alkoxide) ligand H[OO] and its iron(ii) complex Fe[OO](THF) are described. The coordination of the ligand to the metal center is reminiscent of the coordination of two monodentate alkoxides in previously reported Fe(OR)(THF) species. Fe[OO](THF) catalyzes selective and efficient dimerization of non-bulky aryl nitrenes to yield the corresponding azoarenes.
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