Highly Efficient Solvent Free Oxidation of Ethyl benzene Using Reusable Heterogeneous Nano-catalysts: The Role of SiO2-Al2O3 mixed-oxide and linker in Competency of Mn(III)-Schiff base complexes

Publish Year: 1388
نوع سند: مقاله کنفرانسی
زبان: English
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CNS03_122

تاریخ نمایه سازی: 21 دی 1388

Abstract:

SiO2-Al2O3 mixed-oxide was functionalized with 3-aminopropyl triethoxy silane and 2-aminoethyl-3- aminopropyl trimethoxy silane groups. Mn(III)-Schiff base complexes covalently linked on these organo-functionalized SiO2-Al2O3 mixed-oxide. The support and the type of organo-functional group influenced the electronic structure (oxidation state and redox behavior) and regioselectivity of the Mn-complexes in the oxidation of ethyl benzene with tert-butyl hydroperoxide without using solvent. The Mn ions were reduced from the oxidation state of +3 to +2 state; the tendency for this reduction on different supports decreasing in the order of: SiO2-Al2O3 mixed-oxide-2-aminoethyl- 3-aminopropyl trimethoxysilane> SiO2-Al2O3 mixed-oxide-3-aminopropyl trimethoxysilane. Mn(III)-Schiff base complexes supported on 2-aminoethyl-3-minopropyl trimethoxysilane-functionalized SiO2-Al2O3 yielded acetophenone with 90% regioselectivity. The selectivity of the catalyst remained almost unchanged after four cycles, but the catalytic reactivity decreased gradually. The AAS analysis indicates that the decrease in the activity of the catalyst is not mainly attributed to the leaching of Mn during the catalytic runs.

Authors

M Arshadi

Department of Chemistry, Isfahan University of Technology, Isfahan

M Ghiaci

Department of Chemistry, Isfahan University of Technology, Isfahan