Water → 4-Chlorophthalic acid

Participants

Reaction Steps

The starting material is prepared as follows: The mixture of 9.0 g of 4-chloro-o-xylene and the solution of 60.7 g of potassium permanganate in 280 ml of water is refluxed until the purple color disappears (about 7 hours) whereupon 3/4 of the water are distilled off and the remaining suspension is filtered while still hot. The residue is washed with hot water several times the clear and colorless filtrate (pH~12) is concentrated to about 50 ml and acidified with 33 ml of concentrated hydrochloric acid. The cold mixture is extracted 3 times with ethyl acetate, the organic layer dried and evaporated to give the 4 -chlorophthalic acid.

Provenance & Evidence