The imidazolyl compounds may alternatively be pre pared by reacting, under the conditions specified above in regard to the other monophosphonium halides, a compound such as tributylvinylphosphonium bromide or tricyclohexylvinylphosphonium bromide, etc., with an appropriately substituted imidazole, e.g., 2-methyl imidazole by refluxing in a suitable solvent.