| 摘要 |
PURPOSE:To prepare the titled compound economically or an industrial scale, without producing by-products, by reacting a polycyclic aromatic hydrocarbon with a ceric salt as an oxidizing agent in the presence of a specific solvent immiscible with water, in an aqueous solution of an acid. CONSTITUTION:The objective compound can be prepared by reacting a polycyclic aromatic hydrocarbon such as naphthalene with a ceric salt (e.g. ceric sulfate, etc.) using an alkylbenzene or chlorobenzene of formula (R1, R2 and R3 are alkyl, and the sum of the carbon numbers of the alkyl groups is 3-6) as a solvent, in an aqueous solution of an acid, at 30-80 deg.C, preferably 40-60 deg.C. The amount of the solvent of the above formula is preferably selected to obtain e.g. a naphthalene concentration of 20-60%, especially 40-50% when the raw material is naphthalene. The acid used in the above reaction is preferably sulfuric acid, and its concentration is preferably 6-12%.
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