Ketenimine-ylides Ph₂C=C-N⁺(=CCl₂)Ar, formed by the reaction of N-(2,2-diphenylvinylidene)anilines with dichlorocarbene, generated by heating sodium trichloroacetate in chloroform, undergoes [2+3]-cycloaddition with dimethylacetylenedicarboxylate, methyl methacrylate, and dimethyl fumarate to give pyrrole derivatives; in addition, pyridine derivatives are formed in the reaction with dimethyl fumarate. In the absence of a dipolar compound, ketenimines-ylides give N-aryl-N-(2,2-diphenylvinyl)amides of di- and trichloracetic acids.