Method J.-@-Resorcylic acid (1.0 mole) in glacial acetic acid was chlorinated with chlorine (1.0 mole) also in glacial acetic acid. The acid produced always contained some dichloro compound as shown by analysis. This was removed by refluxing the reaction mixture in aqueous solution for several hours. Under these conditions the dichloro acid decomposes more rapidly than the mono-chloro acid to give the dichlororesorcinol, which is very ...
