A process for producing 2-aryl-2H-benzotriazole by reducing an o-nitroazobenzene with a saccharide having an aldehyde group as a reducing agent in the presence of fluorenol as a catalyst and a base in solution. The reaction is conducted at a temperature of from about 60.degree. C. to about 80.degree. C. The reaction time and amount of catalyst is significantly reduced compared to the use of an aromatic ketone catalyst. The invention also provides a method for producing 2-aryl-2H-benzotriazole by reducing a 2-aryl-2H-benzotriazole-N-oxide intermediate with a saccharide having an aldehyde group as a reducing agent, in the presence of fluorenol under similar conditions.
本发明提供了一种制备2-芳基-2H-苯并三唑的方法,通过在存在
芴酚催化剂和碱的溶液中,使用具有醛基的
糖类还原剂还原o-硝基
偶氮苯。反应温度在约60℃至约80℃之间。相比使用
芳香酮催化剂,反应时间和催化剂用量显著降低。本发明还提供了一种方法,通过在类似条件下,在存在
芴酚的情况下,使用具有醛基的
糖类还原剂还原2-芳基-2H-苯并三唑-N-氧化物中间体来制备2-芳基-2H-苯并三唑。