Reactions of diphenic acid with carbamide as a way to acyclic and cyclic amides of diphenic acid

On the basis of reaction of diphenic acid with carbamide in the conditions of azeotropic water distillation a new way of producing acyclic and cyclic amides of diphenic acid has been found. The nature of aminating agent is shown to determine composition of reaction products: at aminating diphenic acid not substituted by carbamide the basic product is imide, whereas at aminating by substituted carbamide and amines it is corresponding monoamide. On the basis of experimental data the mechanism of the reactions is suggested