The kinetics and stereochemical course of reactions of Cr(OH2)6I2+, cis-and fra«j-Cr(OH2)4(OS-(CH3)2)I2+, and cis-and ^ « -0•( 2)4(05(( 3)2)23~i n acidic aqueous dimethyl sulfoxide have been studied. The solvolysis of Cr(OH2)5I2+ in this solvent gives zra/is-Cr(OH2)4(OS(CH3)2)I2+ confirming a suggestion of Moore, Basolo, and Pearson. This species then loses iodide to give both isomeric species of the composition Cr(OH2)4-(OS(CH3)2)23-. Both isomers of Cr(OH2)4(OS(CH3)2)I2"1" are produced when chromium(II) is oxidized with triiodide ion in acidic aqueous dimethyl sulfoxide. Identification of isomeric species was accomplished by consideration of their reactivity patterns and by comparison of their relative abundances with the statistically expected values. The earlier identification of ris-Cr(OH2)4(OS(CH3)2)23+ as the more easily eluted bis(dimethyl sulfoxide)chromium(ill) species has been confirmed.

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Any desired F:AI mole ratio in uncontaminated solid aluminum hydroxyfluorides may be obtained by electrolysis of a solution containing aluminum and fluoride in the desired ratio. The electrolysis process removes hydrochloric acid from solution; thus the sample solution is basicified without adulteration, since no chemical base was added to the system.

Untersucht wird die Kinetik und der stereochemische Verlauf der Titelreaktion sowie die Reaktionen von cis‐ und trans‐Jodo‐dimethylsulfoxid bzw. Bis‐[dimethylsulfoxid]‐tetraaquochrom(III) mit Dimethylsulfoxid.