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ChemInform Abstract The benzothiazoline (III), the condensation product from (I) and (II), is converted into its oxidized form (IV) by interaction with the five-coordinate tetrahalooxometalate(V) complexes (VI). The reaction proceeds very rapidly at room temp., and only a small amount of metal complex is necessary to obtain conversion of a large excess of (III) to (IV). When M: Re, the intermediate (V) in the reaction sequence can be isolated. A general scheme accounting for these and other results is given. The ligand (IV) also reacts with the complexes (VI) to give the anionic complexes (VII) as shown and, using > 4 equiv. (IV) in refluxing ethanol, the neutral bis(ligand) complexes (VIII). The complexes are characterized by elemental analysis, IR, 1H NMR, and mass spectral analysis. The structure of the title complex (VIIa) (X: Cl; space group P212121, Z=4) is determined by X-ray analysis (for (III) and (IV) no yields given).

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