Active site structures of T4MOH/D peroxo intermediates from crystallographic studies of Fox and co-workers.70 Left: T4MOH/D μ-1,1-(hydro)peroxo species (Pμ1,1, PDB ID 5TDV). Fe, O, N, and C atoms are shown in brown, red, blue, and green, respectively. Right: T4MOH/D μ–η2:η2-OOR species (Pη22, PDB ID 5TDT). The substrate molecule is labeled MBN for methylbenzene. Reproduced from ref 70 with permission. Copyright 2017 Nature Publishing Group.