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CONCLUSION
We report the first systematic study of the effect of
solvent on the catalytic oxidation of styrene by four Mn(III)
corroles having different electronic features in the presence
of PhIO as oxidizing agent. We found that the properties of
solvent itself has remarkable effect on the catalytic activity
of Mn(III) corrole catalysts. The transformation of Mn(III)
corroles into their corresponding Mn(V)-oxo corroles,
and their subsequent reaction with styrene in a variety of
solvents was also performed. It was observed that more
electron-deficient Mn(V)-oxo corroles exhibit higher
reactivity towards styrene in DCM and toluene, while
less electron-deficient Mn(V)-oxo corroles exhibit higher
reactivity towards styrene in basic solvents (DMF, DMAc).
A plausible catalytic mechanism is suggested based on the
combined catalytic and kinetic data. It is evident that the
catalytic oxidation of styrene by manganese corroles may
proceed via oxygen atom transfer (OAT) between Mn(V)-
and/or Mn(VI)-oxo corrole intermediate and the substrate,
or via dioxygen involved free radical process, depending
on the solvent used during the catalytic reaction. Further
investigations of solvent effects on the properties of
various Mn(V)-oxo corroles derived from various electron-
donating and -withdrawing substituents and their catalytic
oxidation reactions are currently underway.
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The financial support from the National Natural
Science Foundation of China (21171057, 21371059) is
gratefully acknowledged.
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