REACTION OF 2-AMINOBENZIMIDAZOLE WITH ACETYLENE

Article abstract of DOI:10.1007/BF00863093

The reaction of 2-aminobenzimidazole (1) with acetylene under pressure proceeds with the formation of vinyl monomers, corresponding to amine and imine forms, 1-vinyl-2-amino- and 1,3-divinyl-2-iminobenzimidazoles, depending on the reaction conditions. 1,3-Divinyl-2-benzimidazolone was also isolated in aqueous dioxane in addition to the monovinyl derivative of 1.Cyclization of the divinyl derivative of 1 with acetylene preceeds to give 9-vinyl-1,2-dimethylimidazo<1,2-a>benzimidazole. Keywords: 2-aminobenzimidazole, acetylene, vinyl monomers.