Reacción #56597

Ecuación de reacción

1-(4-nitro-phenylazo)-4-(dimethylamino)naphtalene

sodiumhydrogen sulphate nonahydrate

methanol

→

1-(4-amino-phenylazo)-4-(dimethylamino)naphtalene

Disolventes

water

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturawas heated
2. 2
   Temperaturaat reflux for 3 h
3. 3
   FiltraciónThe brownish precipitate was filtered off
4. 4
   Lavadowashed with water (200 ml) and cold methanol-water (100 ml/100 ml)

Procedimiento

A mixture of 15 g of 1-(4-nitro-phenylazo)-4-(dimethylamino)naphtalene, 75 ml sodiumhydrogen sulphate nonahydrate (50% wt in water) and 80 ml of methanol was heated at reflux for 3 h. The reaction mixture was then cooled to room temperature and poured into 300 ml of water. The brownish precipitate was filtered off, washed with water (200 ml) and cold methanol-water (100 ml/100 ml) to give 12 g of nearly pure 1-(4-amino-phenylazo)-4-(dimethylamino)naphtalene as a brownish solid.

Fuente