Electrochemical Behavior of Chloropyridines in N, N-Dimethylformamide-Water Media

Abstract

In N, N-dimethylformamide (DMF) Water media, dechlorination waves and a reduction wave of pyridine nucleus were shown for chloropyridines at the dropping mercury electrode. The elimination wave of a chlorine corresponds to irreversible two-electron wave. The reduction wave of pyridine nucleus corresponds to irreversible one-electron wave in DMF and to irreversible two-electron wave in water containing DMF. The process of dechlorination was studied by controlled potential electrolysis and number of electrons transfered during the electrode reaction was determined. The UV spectra of the solution after controlled potential electrolysis were also examined.
The kinetic parameter of the dechlorination process were determinded by cyclic voltammetry. ks= (0.72-1.20) x105 cm and a = 0.1-0.2.
The present data indicate that mechanisms for the electrode reaction in DMF, DMF-water media are as follows ;