Reaction of carboxylic acid amidines with ketimines

Diphenyl- and trifluoromethylphenylketimines undergo the Diels-Alder reaction with amidines of benzoic and trichloro- and trifluoroacetic acids to give dihydro-sym-triazines through intermediate azadienes. The structures of the synthesized compounds were proved by means of their IR, PMR, and mass spectra.