Sulfuric Acid → 4-Benzoyl-2,3-dihydro-1H-inden-1-one

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Reaction Steps

In 100 ml. of acetic acid is dissolved 11.1 g. of 4-benzyl indan-1-one, followed by the addition of 13.4 g. of chromic acid and 2.5 ml. of concentrated sulfuric acid. The mixture is stirred at room temperature for 2 hours, after which it is poured into 4 l. of water. After 200 g. of anhydrous potassium carbonate is added, the mixture is extracted with chloroform. The organic layer is washed with water and dried over anhydrous magnesium sulfate. The solvent is distilled off under reduced pressure and the oily residue is purified by column chromatography on silica gel with chloroform as the eluent and, then, recrystallized from cyclohexane. The procedure gives 4-benzoylindan-1-one melting at 87°-89° C.

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