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 3W6) as a solvent, in an aqueous solution of an acid, at 30W80°C, preferably 40W60°C. The amount of the solvent of the above formula is preferably selected to obtain e.g. a naphthalene concentration of 20W60%, especially 40W50% when the raw material is naphthalene. The acid used in the above reaction is preferably sulfuric acid, and its concentration is preferably 6W12%.
NUMATA SHIGEAKI
SUMINO TOSHIHIKO
| JPS4934978A | 1974-03-30 |