Oxidation of Furans and Aldoses

Technically important is the dimethoxylation of furan and its derivatives to form 2,5-dimethoxy-2,5-dihydrofuran (Eq. (13)) and the oxidation of aldoses to 

Activated methylene components like malonic esters and P-ketoesters can be coupled anodically using small amounts of potassium iodide as redox catalyst (Table 4, No. 4-7) i45-i5n -pj g cathodically formed metallic potassium is used to deprotonate the methylene component generating the oxidizable carbanion. The combination of this reaction with the cathodic hydrodimerization of acrylic esters has been studied several times (Table 4, No. 7) Thus both electrode reac- 

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