2-Methylbenzenesulfonic acid → 4,5-Dichlorophthalic anhydride

Beteiligte Stoffe

Reaktionsschritte

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.

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