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■ Electrochemical Synthesis of 2-Aryl-2H -benzotriazoles and Their N -Oxides by Controlled Potential Cathodic Electrolysis

Byeong Hyo Kim,* Doo Byung Lee, Dae Ho Kim, Rongbi Han, Young Moo Jun, and Woonphil Baik

*Department of Chemistry, Kwangwoon University, Seoul, 139-701, Korea

Abstract

Using a divided cell, reductive cyclizations of o-nitrophenylazo dyes (1) toward 2-aryl-2H-benzotriazole-1-oxides (2) or 2-aryl-2H-benzotriazoles (3) were successfully accomplished by the controlled potential cathodic electrolysis reactions. 1 was transformed to 2 under neutral conditions while 1 was transformed to 3 under basic conditions.