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We know that ethanol is oxidised by copper(II) oxide to an aldehyde. Copper is reduced from $\ce{Cu^2+}$ to $\ce{Cu}$. Can this reaction, with some specific condition, yield $\ce{Cu2O}$ instead? That will also be a reduction of copper, only partial.

The question was asked on a Russian chem forum and it made me curious.

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  • $\begingroup$ If you add an excess of a reducing sugar to the mix, the copper(II) should all get reduced back to copper(I), i.e. Cu2O. I'm pretty sure that's not what you mean though ;) $\endgroup$
    – airhuff
    Feb 18, 2017 at 4:47

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