Formaldehyde → 2-((2-Nitrophenyl)azo)-4-(1,1,3,3-tetramethylbutyl)phenol

Participants

Reaction Conditions

Reaction Steps

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 mixure was stirred while raising temperature to 65° C. Thereafter, the mixture was cooled to 40° C., and 9-fluorenone 0.8 g and then 80% paraformaldehyde 2.1 g were added to the mixture for 1 hour. The resultant mixture was then heated to the boiling point (75° C.), and was stirred at the boiling point 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).

Provenance & Evidence