This concept of the mechanism of reaction is supported by the results in perchloric acid solution. Sherrill, et al.,b have shown that no complex is formed in cerium (IV) perchlorate. Under such conditions the observed reaction should be essentially the termolecular reaction (2). This would explain why the rate is greater in perchloric acid (Fig. 2), but reaction is still not instantaneous.

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magnitude is a function of the "electron-sharing ability'' of the radical linked to the amine group.

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Synthesis of Isoquinoline Acids 183 phosphoric esters to thiamin, thus allowing materials containing cocarboxylase to be assayed by the thiochrome method. Such an assay gives results agreeing with biological tests.According to our findings one International Unit is equivalent to 2.9 Mg. of thiamin chloride and 4.0 Mg• of cocarboxylase. New York, Ñ. Y.

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