The　reactions　of　1,4-diazabutadienes　1　with　HClO4　were　studied　in　detail.　The　final　products　obtained　were　not　the　hydroperchlorates　of　1　but　imidazolium　perchlorates　2　or　3.　A　possible　reaction　process　is　postulated　on　the　basis　of　the　isolation　of　the　intermediate　2-iminomethylimidazolium　salt　4.　The　factors　influencing　the　conversion　of　4　to　the　imidazolium　perchlorates　2　and　3　were　discussed　with　regard　to　the　electronic　and　steric　effects　of　the　N-substituents.　This　reaction　can　serve　as　an　approach　for　the　synthesis　of　imidazolium　derivatives.