In attempting to purify cuminic acid by boiling with chromic acid, I observed that this acid experienced, on the part of this reagent, a progressive alteration. By twenty-four hours’ ebullition, cuminic acid is completely converted into an acid insoluble in alcohol and ether, for which I propose the provisional name of insolinic acid; purified by the ordinary processes, this body furnished on analysis the following relations:— C9H4O4; but the analysis of the salts demonstrates that this formula must be doubled, insolinic acid being a bibasic acid.
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A. W. Hofmann (1857) studied this question.
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