Abstract
The oxidation of 2-methylnaphthalene ( 1) to 2-methyl-1,4-naphthaquinone ( 2), by tetraalkylammonium dichromate and ammonium dichromate in acidic solutions of acetonitrile-water, is catalysed by RuCl 3. A reaction between the dichromate reagent and RuCl 3 is observed at 50°C but is too slow to be observed at 20°C although the catalysed oxidation is already evident at 20°C. Increasing the temperature enhances both the rate of oxidation of 1 and selectivity for 2 whereas increasing the concentration of RuCl 3 increases the selectivity rather than rate of oxidation. The effect of RuCl 3 is possibly through enhanced oxidation of water. The ruthenium IV compound (NH 4) 2RuCl 6 has no effect.
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