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■ 1-Chlorobenzotriazole-mediated Ring Closure of 1,3,5-Triarylformazans: Improved Syntheses of 2,3,5-Triaryl-2H-tetrazolium Salts

Alan R. Katritzky,* Sergey A, Belyakov, Jamshed N. Lam, H. Dupont Drust, and Dmitrii V. Karpenko

*Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL 32611-2046, U.S.A.

Abstract

Oxidative ring closure of mono- and bis-triarylformazans mediated by easily available 1-chlorobenzotriazole leads to the corresponding 2,3,5-triaryl-2H-tetrazolium chlorides in yields of 70-97%.