Abstract
Abstract Oxidation of a wide range of cyclic and acyclic olefins with tetra-n-butylammonium periodate shows different orders of catalytic activity for a series of electron-rich and electron-deficient Mn-porphyrins in oxidation of various alkenes. While the Mn(III) complex of meso-tetra(4-thiomethoxyphenyl)porphyrin, MnT(4-SCH3P)P(OAc), has the highest activity among the series, the β tetra-brominted derivative shows the lowest catalytic efficiency for the oxidation of the used olefins with the exception of cis- and trans-stilbene. The results clearly show that the electron-withdrawing effects of meso- and β-substituents may increase or decrease the catalytic activity of Mn-porphyrins in the case of different olefins.
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