The SAr reaction of 4,5-dichlorophthalonitrile with various bifunctional nucleophiles was carried out in anhydrous DMF in the presence of KCO as a deprotonating agent. It was shown that 4,5-dichlorophthalonitrile can be successfully employed in the synthesis of heterocyclic compounds; however, in some cases, these reactions may either give product mixtures or result in an unexpected rearrangement.
V.L. Baklagin (Wed,) studied this question.