反应详情

温度

65 °C

2-nitro-2'-hydroxy-5'-methylazobenzene 12.9 g was added to a mixture of methanol 60 ml, water 30 ml and 97% sodium hydroxide 12.4 g, and the resultant mixture was stirred while raising temperature to 65° C. 9-fluorenone 1.2 g and then 90% acetoaldehyde 6.5 g were added to the mixture for 1 hour. The resultant mixture was then stirred at the boiling point (75° C.) for 6 hours, thus almost all of the azobenzene having disappeared to produce 2-(2-hydroxy-5-methylphenyl)benzotriazole-N-oxide (Process (b) having completed). In order to conduct Process (c), the reaction liquor was further stirred at the boiling point for 5 hours, thus the N-oxide having disappeared to complete Process (c).