• Oxygenation of saturated and unsaturated hydrocarbons with sodium periodate catalyzed by manganese(III) tetra-arylporphyrins, to study the axial ligation of imidazole

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      https://www.ias.ac.in/article/fulltext/jcsc/118/05/0429-0433

    • Keywords

       

      Imidazole; periodate; manganese(III); axial ligation; oxygenation of hydrocarbons; tetraarylporphyrins

    • Abstract

       

      Competitive oxygenation of cyclooctene and tetralin with sodium periodate catalyzed by Mn(III)(TPP)OAc, TPP = meso-tetraphenylporphyrin; Mn(III) (TNP)OAc, TNP =meso-tetrakis(1-naphthyl) porphyrin; Mn(III) (TMP)OAc, TMP =meso-tetrakis(2,4,6-trimethyl-phenyl)porphyrin; Mn(III) (TDCPP)OAc, TDCPP =meso-tetrakis(2,6-dichlorophenyl) porphyrin, and Mn(III) (TPNMe2-TFPP)OAc, TPNMe2-TFPP =meso-tetrakis(para-NMe2-tetrafluorophenyl)porphyrin, was carried out in the presence or absence of imidazole. This study showed that, in the absence of imidazole, selectivity for epoxide formation was high with electron-rich catalysts such as Mn(TPP)OAc, Mn(TNP)OAc and Mn(TMP)OAc, but low with electron-deficient catalysts such as Mn(TDCPP)OAc and Mn(TPNMe2-TFPP)OAc. Presumably, not only the axial ligation of imidazole to the four-coordinate Mn(III)-center, but also the steric and electronic influences of aryl-substituents on the porphyrin periphery affect the selectivity of the catalytic oxidation reaction.

    • Author Affiliations

       

      Reza Tayebee1

      1. Department of Chemistry, Sabzevar Teacher Training University, Sabzevar - 397, Iran
    • Dates

       
  • Journal of Chemical Sciences | News

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