Abstract
In the previous paper, the mechanism of reduction of glyoxals has been discussed. Transfer of two electrons results in hydroxyacetophenone (C 6H 5COCH 2OH) formation. This compound can be reduced in a consecutive step according to two processes in aqueous media of different acidities. In neutral media, the keto grouping is reduced yielding hydroxyphenethylalcohol: C 6H 5CHOH CH 2OH. In acidic media, the COH bond is reductively cleaved, so the whole four electron transfer can be written: ▪ This reaction constitutes an original way of reduction, an aldehyde grouping yielding a methyl grouping. The COH cleavage is exclusive for aliphatic α-hydroxycarbonyl derivatives: ▪
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