Abstract Dicyandiamide was found to undergo a four electron reduction at a mercury cathode at− 1.05 v (SCE) although no distinct polarographic wave was obtained. At a palladium black cathode, dicyandiamide was reduced at− 0.10 v (SCE) with 100% current efficiency to give the dihydro compound. This difference in products is believed to be caused by direct electron transfer in the former case and reduction by chemisorbed hydrogen in ...
