| abstract |
Process for the preparation of imidazoles by reacting carboxylic acids with 1,2-diamines or by reacting 2-imidazolines at temperatures from 300 to 600 ° C. in the presence of zinc oxide or a mixture of zinc oxide and aluminum oxide as catalysts. The imidazoles which can be prepared by the process of the invention are starting materials for the production of dyes, crop protection agents, textile auxiliaries, catalysts for polyurethanes and epoxy resins, surface-active agents and pharmaceuticals. |