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Cacodylic acid is an arsenical with the structural formula HOAsO(CH,),. Since its pKa is 6.15, cacodylic acid is often used along with an appropriate cation to buffer enzyme-catalyzed reactions. We report here that cacodylic acid reacts with various SH-containing materials that are commonly used in enzyme-catalyzed reactions, such as 2-mercaptoethanol, cysteine, glutathione, and dithiothreitol. When cacodylate and these alkyl thiols are present together they may be expected to react spontaneously and thus interfere with the study of other reactions either by depleting the amount of these substances or by producing a product that is inhibitory.

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A 0.0033% solution of D-[FeTS2]N03, obtained as before, gave of +0.018 ± 0.003°, +]d +545°.Further work on this and other poly dentate ligands is in progress.The authors' best thanks are due to the University of Illinois and to the National Science Foundations for providing funds to one of them (Das Sarma).

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