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Communication | Regular issue | Vol 51, No. 8, 1999, pp.1779-1783
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8597
Photostimulated Reductive Cyclization of o-Nitrophenylazo Dyes Using Sodium Hydroxide in Isopropyl Alcohol. A New Synthesis of 2-Aryl-2H-benzotriazoles

Woonphil Baik,* Chang Hyun Yoo, Sangho Koo, Hern Kim, Yong Hyun Hwang, Byeong Hyo Kim, and Seok Woo Lee

*Department of Chemistry, Myong Ji University, Yong In, Kyung Ki-Do, 449-728, Korea


o-Nitrophenylazo dyes with NaOH were irradiated in isopropyl alcohol to give the corresponding benzotriazoles. The photostimulated reductive cyclization proceeds through the formation of N-oxides as an intermediate.