反应详情

225 g (0.46 mol) of octyl 3-(5-chloro-2H-benzotriazole-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-benzene propanate manufactured by CIBA GEIGY INC. under the trade name of "TINUVIN 109" were dissolved in 700 ml of acetone. To the resulting solution were added 600 ml of a 2N aqueous solution of sodium hydroxide followed by agitation at room temperature for 24 hours. Then, 650 ml of a 2N aqueous solution of hydrochloric acid was added to give an acidic solution and an insolubilized product was filtered off and rinsed with distilled water until the filtrate turned neutral. After vacuum-drying the product, it was recrystallized from toluene to give 3-(5-chloro-2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy benzene propanoic acid, referred to hereinafter as a precursor (3).

1. customto give an acidic solution
2. filtrationan insolubilized product was filtered off
3. washrinsed with distilled water until the filtrate
4. customAfter vacuum-drying the product, it
5. customwas recrystallized from toluene