Ligational and conformational effects on the rates of reductive cleava
ge of ligated forms of [Fe((DMG)BPh(2))(2)]O-2 by 4-tert-butylcatechol
are elucidated. The site-differentiated LFeN(4)-O-FeN4 species is the
redox-active form. Trans ligands which stabilize higher oxidation sta
tes enhance the rate of reduction by stabilizing a LFe(IV)-O-Fe-II res
onance form.