ABSTRACT
There is a constant need in synthetic chemistry to develop practical methods for electrooxidation of alcohols. 1 We have already reported an efficient procedure for the alcohol oxidations by using a combination of two redox couples, Ru(VIII)/Ru(IV) and [CI+]/CI−, as a mediator. 2 Such double mediatory tactics are advantageous in comparison with single mediatory systems especially for the oxidation of secondary alcohols. Improved current efficiency and high turnover of reagents is observed, but the transformation of primary alcohols to the corresponding aldehydes and 1,2-diols to diketones fails. We developed an improved method for the selective electrooxidation of alcohols by using 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) derivatives 4 and bromide ion as recyclable reagents for the chemical and the electrochemical processes.
