1,4-Dibromo-2-butyne → 1-(4-Bromo-2-butyn-1-yl)-5, 6-dichloro-3-ethyl-2-methylbenzimidazolium bromide

Participants

Reaction Steps

5,6-Dichloro-1-ethyl-2-methylbenzimidazole (11.5 g., 0.05 moles) and 1,4-dibromo-2-butyne (31 g., 0.15 moles) were mixed together and stirred at room temperature overnight. The reaction mixture was treated with ether, the solid was collected by filtration, washed with ether and dried. It was recrystallized from acetonitrile containing 5% water (400 ml). The product was recovered in two crops. Yield 20.2 g (92%), mp. 185°-189° C.

Provenance & Evidence