反应详情

温度

100 °C

2-Phenyl-6-nitrobenzothiazole (73.5 g, 0.286 mol) is added to tin dichloride (200.74 g, 0.89 mol) in 37% HCl (300 ml). The mixture is heated at 100° C. for 40 minutes. The resulting mixture is cooled and aqueous ammonia (pH=10) is added dropwise. The product is extracted with chloroform and the extracts are concentrated. The solid is recrystallized from isopropyl ether/hexane (2/1). Yield: 29.9 g (46%); Rf (9/1 chloroform/methanol): 0.68; m.p.: 199.8-201.1° C.; IR (KBr): 3450, 3305, 3190, 1619 cm−1.

1. temperatureThe resulting mixture is cooled
2. extractionThe product is extracted with chloroform
3. concentrationthe extracts are concentrated
4. customThe solid is recrystallized from isopropyl ether/hexane (2/1)