Sodium Hydroxide → 5-Benzoyl-6-hydroxy-2,3-dihydro-1H-indene-1-carboxylic acid

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Reaction Steps

A solution of 8.2 g of 5-benzoyl-6-hydroxy-indane-1-carboxylic acid methyl ester in 150 ml of methanol is mixed with 20 ml of 2 N sodium hydroxide solution and the mixture is boiled for 3 hours under reflux. It is then evaporated to dryness in vacuo and the evaporation residue is partitioned between 100 ml of 2 N hydrochloric acid and 3 times 100 ml of methylene chloride. The organic phases are washed until neutral, dried over sodium sulphate, treated with active charcoal and evaporated in vacuo. The evaporation residue, when crystallised from ethanol-petroleum ether, gives 5-benzoyl-6-hydroxy-indane-1-carboxylic acid in the form of yellow platelets of melting point 185°-7° C.

Provenance & Evidence