Australian journal of chemistry

The reduction of some o-Nitrophenylazo dyes with thiourea S, S-Dioxide (Formamidinesulfinic acid): a general synthesis of 2-Aryl-2H-benzotriazoles and their 1- …

J Rosevear, JFK Wilshire

文献索引：Rosevear, Judi; Wilshire, John F. K. Australian Journal of Chemistry, 1984 , vol. 37, # 12 p. 2489 - 2497

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被引用次数: 15

摘要

Abstract Thiourea S, S-dioxide (formamidinesulfinic acid) reacts with o-nitrophenylazo dyes in ethanolic alkali to give, depending on the reaction conditions, either the corresponding 2- aryl-2H-benzo-triazoles or their 1-oxides. The reagent is particularly effective for preparing in high yield 2-(2'H-benzotriazol-2'-yl) phenols, which are important ultraviolet absorbers. The corresponding reductions involving ammonium sulfide and sodium dithionite were also ...