反应详情

37.4 g (0.1 mol) of 2-(2'-hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole-N-oxide, 0.25 g of Raney nickel catalyst, 150 ml of toluene, 100 ml of 2-butanol and 0.5 g of 1,5-diazabicyclo[5.4.0]undecene were charged into a 500-ml stainless autoclave equipped with an agitator. After the air in the autoclave had been replaced by nitrogen, hydrogen was charged to a pressure of 8 kg/cm2. The temperature of the resultant mixture was increased to 60° C. under agitation, and reaction was been effected while agitation being continued until no hydrogen gas was absorbed by the mixture. After the reaction had been completed, after treatment was performed in the same way as that employed in Example 9 to obtain 28.2 g of 2-(2'-hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole as a target substance (yield, 79%; melting point, 153° to 155° C.).

1. customequipped with an agitator
2. additionwas charged to a pressure of 8 kg/cm2
3. customwas absorbed by the mixture