Potassium trimellitate was heated under CO
2 pressure in the presence of CdI
2 and K
2CO
3 under various conditions so as to clarify the effects of reaction temperature, reaction time, additives of CdI
2 and KHCO
3, and the degree of neutralixation of the original trimellitic acid salt. As by-products, varieties of benzene carboxylic acids such ass phthalic, isophthalic, and prehnitic (1, 2, 3, 5-benzene tetracarboxylic) acids were identified. Tripotassium trimellitate underwent decarboxylation-carboxylation reaction under relatively mild conditions. The decarboxylation reaction appears to take place with the following order of readiness : 4-position>l-position>2-position.
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