METHOD FOR PREPARING 1-INDANONES

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PROBLEM TO BE SOLVED : To provide a method for inexpensively and easily preparing indanones useful as synthetic intermediates of drugs and agricultural chemicals by the dehydration condensation of an aromatic hydrocarbon with a β-lactone while inhibiting formation of chemical substances which cause environmental pollution. SOLUTION : The method for preparing the indanones represented by formula (IV) (wherein R1 to R8 are each a group which is not involved in the reaction) comprises reacting an aromatic hydrocarbon represented by formula (I) ( R1 to R4 are the same as defined above) with a β-lactone represented by formula (II) (wherein R5 to R8 are the same as defined above) in the presence of a catalytic amount of a Lewis acid represented by formula (III) : MXmLn (wherein M is a metallic ion selected from Bi, Ga, In, Hf, and rare earth elements; X is an anion; L is an neutral molecule having coordination power; m is a valence of the metal M; and n is an integer of 0-100). This method can prepare 1-indanones in a shorter step than the conventional method, and thus is useful for industrial practice.