反应详情

95% potassium hydroxide 17.7 g was added and dissolved in a mixture of ethyl alcohol 80 ml and water 10 ml. 2-nitro-2'-hydroxy-5'-methylazobenzene 12.9 g was then added to the resultant solution at 50° to 60° C. for 30 minutes while stirring, and thereafter 9-fluorenone 0.6 g and 35% formalin 5.6 g were added to the solution in 30 minutes. The resultant mixture was stirred for 1 hour at 65° to 70° C., and was further reacted at the boiling point (85° C.) for 4 hours, thus almost all of the azobenzene having disappeared to produce 2-(2-hydroxy-5-methylphenyl)benzotriazole-N-oxide.

1. customwas further reacted at the boiling point (85° C.) for 4 hours