Iron(III) porphyrin-catalysed oxidation reactions by m-chloro-perbenzoic acid: Nature of reactive intermediates

摘要

The reaction of m-chloroperbenzoic (m-CPBA) acid with meso-tetrakis (pentafluorophenyl) porphynatoiron(III) chloride (F_(20)TPPFe(III)Cl ) has been studied in dichloromethane and acetonitrile medium at 25 +- 1 deg C.The reactive intermediates formed in this reaction have been quantitatively trapped by 2,4,6-tri t-butylphenol (TTBP) in both the solvents.It has been observed that the kinetic plots of the formation of TTBP~(centre dot) radical in dichloromethane are all multiexponential,supporting the formation of more than one reactive intermediate in this solvent.In acetonitrile solvent the formation of TTBP~(centre dot) radical was however observed to be distinctly single exponential.Different kinds of reactive intermediates are proposed in these two solvents.