The ferricyanide–sulphite reaction has been shown to proceed via the intermediates [Fe(CN)5(CNSO3)]5– and [Fe(CN)5(CNSO3)]4–, followed by hydrolysis of the latter to ferrocyanide and sulphate. In the presence of catalysts such as animal charcoal and Cu++aq ions, there is a reduction in the amount of intermediate formed, and radioactive tracer experiments indicate the formation of appreciable quantities of dithionate ion.
J. M. Lancaster and R. S. Murray, J. Chem. Soc. A, 1971, 2755 DOI: 10.1039/J19710002755
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