• Reza Tayebee

      Articles written in Journal of Chemical Sciences

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

      Reza Tayebee

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      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.

    • Assembling of H5PW10V2O40/MCM-48 and studying its superior catalytic performance in the synthesis of 14-aryl-14-H-dibenzo[a, j]xanthenes

      Reza Tayebee Behrouz Maleki

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      A highly efficient, green, and reusable heterogeneous catalytic system is introduced for the preparation of aryl-14-H-dibenzo[a,j]xanthenes via one-pot condensation of 𝛽-naphthol with aryl-aldehydes by the mediation of a heterogeneous material composed of Keggin%-type tungsto-divanado-phosphoric acid, H5PW10V2O40, supported on MCM-48 under solvent-free condition. Excellent yields (85-100%), short reaction time (<60 min.), mild condition, simple work-up, and using a cheap and environmentally friendly catalyst bearing remarkable reusability are advantages of the present methodology. The catalytic efficacy of H5PW10V2O40/MCM-48 over some reported protocols are also overviewed.

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