Hydrogenation of aromatic nitro compounds with a Pt/SiO2-AlPO4 catalyst.
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概要
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In this work we have carried out the reduction of aromatic nitro compounds bearing different substituents with gaseous hydrogen, over a Pt catalyst (3% by weight) supported on a SiO<SUB>2</SUB>–AlPO<SUB>4</SUB> system. The catalyst was obtained by impregnation, the impregnating metal salt being reduced with α-phellandrene. The kinetic data found allow us to describe the reduction of nitrobenzene as a Langmuir–Hinslwood kinetic. The sequence of reaction rates for the different nitro compounds assayed conforms to the Hammett–Taft equation, which allows relating the electron density of the aromatic ring to the reduction rate of the nitro group. Finally, we propose mechanism for the process, characterized by the absence of intermediates with net charges.
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著者
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Rodero Luque
Department of Organic Chemistry, Faculty of Sciences, Córdoba University
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Marinas Rubio
Department of Organic Chemistry, Faculty of Sciences, Córdoba University
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Jiménez Sanch\ridr\rian
Department of Organic Chemistry, Faculty of Sciences, Córdoba University
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Aramendía Lopidana
Department of Organic Chemistry, Faculty of Sciences, Córdoba University
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Borau Bolos
Department of Organic Chemistry, Faculty of Sciences, Córdoba University