Abstract
Preparation of 2-methyl-1,4-naphthoquinone (vitamin K3) by oxidation of 2-methylnaphthalene and 2-methyl-1-naphthol using the nanostructured gold catalysts supported on hypercrosslinked polystyrene (5 % Au/SPS) was investigated. The effect of temperature on the oxidation process was studied; the attempt was made for replacement of the standard solvent – acetic acid to an environmentally friendly supercritical carbon dioxide. It is found that the use of supercritical CO2 is high (near 100 %), selectivity of the oxidation of 2-methyl-1- naphthol to the desired product is stored, wherein the conversion is increased on 10–15 %. Oxidation of 2-methylnaphthalene using supercritical CO2 leads to a drastic reduction of conversion and selectivity to the desired product, resulting from the fact that under these conditions peracetic acid (main oxidant) is formed. The possibility of using gold nanostructured catalysts for selective oxidation of 2-methyl-1-naphthol and 2-methylnaphthalene in 2-methyl-1,4-naphthoquinone (99 and 58% respectively).
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