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In a flask equipped with a stirrer, nitrogen inlet, and DEAN-STARK trap, 10.0 grams of 4,5-dichlorophthalic acid, 150 milliliters of xylene, and several crystals of toluenesulfonic acid were added. The mixture was heated to reflux and water was collected in the DEAN-STARK trap over a period often hours. The xylene was distilled off and the solid was collected in a BÜCHNER funnel and allowed to air dry, yielding 8.3 grams of 4,5-dichlorophthalic anhydride.

1. customIn a flask equipped with a stirrer, nitrogen inlet
2. temperatureThe mixture was heated
3. temperatureto reflux
4. customwater was collected in the DEAN-STARK trap over a period often hours
5. distillationThe xylene was distilled off
6. customthe solid was collected in a BÜCHNER funnel
7. customto air dry