反应详情

To a stirred solution of 2-chlorobenzothiazole (1.0 mL, 8.1 mmol) and malononitrile (534 mg; 8.1 mmol) in acetonitrile (4 mL) was added sodium ethoxide (3.0 mL of 21 wt % solution in ethanol, 8.0 mmol). The mixture was stirred at room temperature for 4 d, then acidified with 2M hydrochloric acid. The solid was collected by filtration, washed with acetonitrile, and dried under vacuum to give 2-(benzothiazol-2(3H)-ylidene)malononitrile (770 mg) as a white solid.

1. filtrationThe solid was collected by filtration
2. washwashed with acetonitrile
3. customdried under vacuum