✍ Scribed by G. Horányi
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A survey is given of those reductive electrocatalytic transformations of carbonyl compounds and molecules containing C-OH bonds in special positions (ally1 position, (z position with respect to a carbonyl group) where the splitting of the carbon-oxygen bond occurs. These reactions take place in acid medium at noble metat (mostly platinized platinum) electrodes. In the case of simple mono-and di-carbonyl compounds (acetone, butanone, acetaldehyde, bi-acetyl, glyoxal, etc.) the formation of the corresponding hydrocarbons may be observed, but these reactions are aoxmpanied by the formation of alcohols or dials, respectively. In the case of allyl alcohol, crotyl alcohol, butenediol, glykolaldehyde, acetoine, etc. the splitting of the C-H bond precedes the reductive transformation of > C==O groups and double bonds. As a consequence of this step, hydrocarbons are formed in the overall process. The possible reaction path are considered and some problems connected with the mechanism and selectivity of these processes are discussed. 1096 G. HORANYI
Table 1. Compounds studied for electrocatalytic splitting of C=O or C-OH bonds at platinized platinum electrodes in acid medium Compound Main splitting products Ref.
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