The reductions of HCrO4- with excess Ge(II), In(I), and Sn(II) give predominantly Cr(II), trapped by its rapid reaction with added (NH3)5CoF2+. The conversions, which involve changes of two units, pass through Cr(IV), bypassing Cr(III), and are thought to proceed by oxygen atom transfer.
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Babich et al. (2001) studied this question.
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