反应详情

温度

0 °C

5-Aminobenzotriazole (4.3 g) was dissolved in a mixture of concentrated hydrochloric acid (24 ml) and water (100 ml) and diazotized at 0° C. with a solution of sodium nitrite (2.2 g) in water (15 ml). The resulting diazonium solution was added at 0° C. to 4-methoxynaphth-1-ol (5.3 g) dissolved in 3 N sodium hydroxide (90 ml) containing sodium acetate (20 g). The resulting mixture was stirred for one hour at 0° C. and then acidified with hydrochloric acid. The dye was filtered off and crystallized in a pyridine/water mixture to give pure material (7.4 g), m.p. 254° C., λmax (methanol)=516 nm.

1. filtrationThe dye was filtered off
2. customcrystallized in a pyridine/water mixture