Method for the preparation of imidazoles.

摘要

Imidazolines can be dehydrogenated into the corresponding imidazoles, in high yield and with good selectivity by contacting the imidazoline at 160 to 300 DEG C and up to 3.55 MPa, with a catalyst comprising nickel-copper, nickel-chromium or nickel-copper-chromium. If desired the imidazoline can be generated by reaction of corresponding diamines with carboxylic acids or nitriles, and converted directly into the imidazoles without being isolated.