反应详情

A mixture of 93.1 parts of aniline and 68 parts of 25% strength aqueous ammonia in 100 parts of propanol, and a mixture of 145 parts of 40% strength aqueous glyoxal solution and 75 parts of 40% strength aqueous formaldehyde solution are simultaneously stirred into 200 parts of propanol in the course of 30 minutes, at 80° C. The mixture is thenkept at 80° C. for a further 30 minutes. Thereafter the solvent is stripped off under reduced pressure and the residue is subjected to fractional distillation. 100.9 parts of N-phenylimidazole (boiling point 128° C./2 mm Hg) are obtained, corresponding to a yield of 70.0%.

1. distillationthe residue is subjected to fractional distillation