Kinetics of the β-hydroxy elimination reactions from the protoporphyrin iron(III)–CHRCH2OH complexes in aqueous solutions. A pulse-radiolytic study

Abstract

The free radicals ˙CH₂CH₂OH and ˙CH(CH₃)CH₂OH react with iron(II)protoporphyrin, Fe^IIPP, to form the transient complexes (PP)Fe^III—CHRCH₂OH. The spectra of these complexes are reported. The transient complexes decompose in a first-order process via the reaction (PP)Fe^III—CHRCH₂OH → Fe^IIIPP + OH^–+ CH₂CHR. The specific rates of the latter reactions are 80 and 40 s^–1 for the two systems, respectively. The results are compared with those for analogous processes.