Abstract
The oxidation of some readily available carbohydrates was investigated in aqueous medium using a catalytic amount of 2,2,6,6-Tetramethyl-1-piperidinyl-oxy (TEMPO) as redox mediator. The regeneration of oxoammonium (active form) was electrochemically performed in alkaline medium at a glassy carbon anode and at controlled potential (0.5 V vs. AgCl/Ag). The primary alcohol groups of the carbohydrates without free aldehyde group, were selectively oxidized to the corresponding sodium uronate with high Faradaic yields. The presence of free aldehyde or hemiacetal groups leads to a decrease in selectivities towards uronic acids and increases the amount of by-products.
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This work was mainly conducted within the framework of a collaborative program CNRS/GRICES between France and Portugal under grant no 20159.
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Parpot, P., Servat, K., Bettencourt, A.P. et al. TEMPO mediated oxidation of carbohydrates using electrochemical methods. Cellulose 17, 815–824 (2010). https://doi.org/10.1007/s10570-010-9417-7
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DOI: https://doi.org/10.1007/s10570-010-9417-7