Potassium Hydroxide → 9-Chlorodibenzothiophene-3-acetic acid

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Reaction Steps

To a 100 ml. flask, fitted with a condenser and containing a solution of 0.28 g. of potassium hydroxide in 50 ml. of ethanol was added 1.1 g. of 9-chlorodibenzothiophene-3-acetic acid ethyl ester. After the solution was refluxed for four hours, the solvent was removed in vacuo on the steam bath, the residue was dissolved in 50 ml. of water, and the aqueous solution was acidified with dilute hydrochloric acid. The product was filtered, washed with 20 ml. of water, and dried at 60° in a vacuum over for 12 hours. The yield of 9-chlorodibenzothiophene-3-acetic acid, after crystallization from methanol, was 0.8 g. (m.p. 203°-206°).

Provenance & Evidence