Leaving group effect porphyrins

Traylor et al. have described studies designed to trap the active species in the catalytic reaction of several iron porphyrins with peracid at room temperature using 2,4,6-tri-tert-butyl phenol (15) and observed an important role of acid on the rate of the oxidation of 15 (72). Lee and Bruice have used a similar method to examine the effect of peroxides on the rate of formation of the corresponding phenoxy radical catalyzed by metalloporphyrins (73). A good correlation between the pKa of the leaving group, a substituted benzoic acid, and the oxidation... 

---