PURPOSE: To obtain the subject compound in high purity and yield at a low cost by increasing the catalyst concentration in a solvent and optimizing the oxidation condition in the oxidation of 2,6-diethylnaphthalene with molecular oxygen in a specific solvent using a transition metal and bromine as a catalyst.
CONSTITUTION: The subject compound useful as a polymeric material, dye intermediate, etc., is produced by oxidizing 2,6-diethyl-naphthalene and/or its oxidation intermediate with a gas containing molecular oxygen in a solvent containing ≥50wt.% of a ≤3C aliphatic monocarboxylic acid using a transition metal and bromine as a catalyst. In the above process, the oxidation is carried out by using ≥3 times weight of the solvent based on the raw material and the objective compound in the presence of ≥0.4wt.% (based on the solvent) of a transition metal comprising Co and/or Mn and ≥0.4wt.% of bromine at 120-250°C under an oxygen partial pressure of 0.1-20kg/cm2.G using preferably ≥0.1mol of the transition metal catalyst based on 1mol of the above raw material. The objective compound can be produced in high purity and yield from the above raw material at a low cost.
TAKEUCHI HARUKI
KAMEI TAKESHI
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