Computer simulation analysis of the experimental plots of effective magnetic moment against pH for aqueous solutions of iron(III) and either l-tartaric acid or citric acid at different concentration ratios has first given the whole aspect of complex formation in a wide pH range 1 to 13 at room temperature. Formation of various kinds of poly- and mono-nuclear complexes has been elucidated in these solutions.

The stereoselectivities in the electron-transfer reactions of [Co(en)3]2+ with eight Δ anionic Co(III) complexes in aqueous solution have been determined by observing the enantiomeric excesses of the [Co(en)3]3+ product. The results are compared with the ion-pairing stereoselectivity between [Co(en)3]3+ and the anionic complexes. Even the Δ anionic complexes which form favorable pairs with Δ-[Co(en)3]3+ yielded the excesses of Λ-[Co(en)3]3+ product.

It was found that aromatic dithio acids readily reacted with aryl isocyanate at room temperature to give the corresponding mixed thioanhydrides with the general formula of (ArCS·S·CONHAr) in excellent yields as stable crystals. The mixed thioanhydrides reacted with primary amines at room temperature to give the corresponding thioamides and asymmetric ureas, while the reaction with secondary amines gave the corresponging amine salts and asymmetric ureas in good yields. The spectral properties of the mixed thioanhydrides were discussed.

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Die Dithiobenzoesäuren (I) reagieren mit den Phenylisocyanaten (II) zu den gemischten Thioanhydriden (III).