Electrocatalytic Oxidative Coupling of Methylquinolines on TEMPO-modified Graphite Felt Electrodes

Article abstract of DOI:10.1246/cl.1993.257

2- and 4-Methylquinolines were oxidized to 2,2'-dimethyl-4,4'-biquinolyl and 4,4'-dimethyl-2,2'-biquinolyl, respectively, both in ca. 94percent isolated yield and ca. 90percent current efficiency on a graphite felt electrode coated with a thin poly(acrylic acid) layer containing 4-amino-2,2,6,6-tetramethylpiperidinyl-1-oxyl (4-amino-TEMPO).The reaction proceeds via electrocatalytic oxidation of the modified-TEMPO species.The electrode was not inactivated during electrolysis and could be used repeatedly.