Abstract
Electrochemical oxidation of pyrrole was investigated in the aq.0.1 N sulfuric acid, BrittonRobinson buffer solution and aq. O.1 N potassium hydroxide solution at a platinum electrode. - 4-Pyrrolin-2-on, 5- (2-pyrroly1)-2-pyrrolidinone, 2, 5-bis(5-oxopyrrolidin-2-yl)pyrrole and pyrrole black were obtained as oxidation products at pH> 10 and pyrrole black was obtained at pH<10. The oxidation potential of pyrrole in 0.1N potassium hydroxide solution at a platinum elcctrode was +0.9 V vs. Hg/HgO. Cathodic polarogram of anolyte at a dropping mercury electrode was measured in the controlled potential electrolysis. In the early stage of oxidation, 4-pyrrolin-2-on and 5-(2-pyrroly1)-2- pyrrolidone was found and then 2, 5-bis(5-oxopyrrolidin-2-yl)pyrrole was detected in accordance with the progress of the electrolysis.
